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Continuous band of stars that appears on plots of stellar color versus brightness
In astronomy, the main sequence is a classification of stars which appear on plots of stellar color versus brightness as a continuous and distinctive
Main_sequence
Dim, low mass stars on the main sequence
massive, smallest, least luminous, and coolest kind of star on the main sequence. Red dwarfs are by far the most common type of fusing star in the Milky
Red_dwarf
Stellar classification
A G-type main-sequence star is a main-sequence star of spectral type G. The spectral luminosity class is V. Such a star has about 0.9 to 1.1 solar masses
G-type_main-sequence_star
Main-sequence star of spectral type O
O-type main-sequence star is a main-sequence—core hydrogen-burning—star of spectral type O. The spectral luminosity class is V, although class O main sequence
O-type_main-sequence_star
Stellar classification
An F-type main-sequence star is a main-sequence, core-hydrogen-fusing star of spectral type F. The spectral luminosity class is V. They have from around
F-type_main-sequence_star
Large self-illuminated object in space
cores. Such stars are said to be on the main sequence and are called dwarf stars. Starting at zero-age main sequence, the proportion of helium in a star's
Star
Stellar classification
A K-type main-sequence star (also called a "K-type dwarf" or "orange dwarf") is a main-sequence (core hydrogen-burning) star of spectral type K. The spectral
K-type_main-sequence_star
Topics referred to by the same term
Blue main-sequence star may refer to: O-type main-sequence star, main sequence stars ranging above 30,000 K B-type main-sequence star, main sequence stars
Blue_main-sequence_star
Point in stellar evolution
Hertzsprung–Russell diagram where it leaves the main sequence after its main fuel is exhausted – the main sequence turnoff. By plotting the turnoff points of
Main_sequence_turnoff
Stellar classification distinguished by bright blue luminosity
supergiant Hypergiants absolute magni- tude (MV) A B-type main-sequence star is a main-sequence (core hydrogen-burning) star of spectral type B. The spectral
B-type_main-sequence_star
Topics referred to by the same term
White main-sequence star may refer to: A-type main-sequence star, main sequence stars ranging from 7,600 to 10,000 K F-type main-sequence star, main sequence
White_main-sequence_star
Blue star with strong helium lines
spectra. Pure helium stars lie on or near a helium main sequence, analogous to the main sequence formed by the more common hydrogen stars. Previously
Helium_star
Classification of stars based on spectral properties
class III for regular giants, class IV for subgiants, class V for main-sequence stars, class sd (or VI) for subdwarfs, and class D (or VII) for white
Stellar_classification
Succession of methods by which astronomers determine the distances to celestial objects
in the diagram called the main sequence. By measuring these properties from a star's spectrum, the position of a main sequence star on the H–R diagram can
Cosmic_distance_ladder
Wolf–Rayet star in the constellation Dorado
they lie on the Zero Age Helium Main Sequence (He-ZAMS), analogous to and parallel to the hydrogen-burning main sequence but at hotter temperatures. During
R136a1
Prospects for habitable planets orbiting a type-F star
F-type main-sequence stars are thought to possibly be the hottest and most massive stars capable of hosting a planet with complex extraterrestrial life
Habitability of F-type main-sequence star systems
Habitability_of_F-type_main-sequence_star_systems
Likelihood of finding extraterrestrial life in yellow dwarf systems
belonging to K-type stars. Yellow dwarfs comprise the G-type stars of the main sequence, with masses between 0.9 and 1.1 M☉ and surface temperatures between
Habitability of G-type main-sequence star systems
Habitability_of_G-type_main-sequence_star_systems
K-type main-sequence stars, also known as orange dwarfs or Goldilocks stars, may be candidates for supporting extraterrestrial life. Due to their smaller
Habitability of K-type main-sequence star systems
Habitability_of_K-type_main-sequence_star_systems
Star in the stage when it has not yet reached the main sequence
A pre-main-sequence star (also known as a PMS star and PMS object) is a star in the stage when it has not yet reached the main sequence. Earlier in its
Pre-main-sequence_star
Star at the centre of the Solar System
initiated nuclear fusion in its core. It is now classified as a G-type main-sequence star (G2V). Every second, the Sun's core fuses about 600 billion kilograms
Sun
Stellar classification
An A-type main-sequence star is a main-sequence (core hydrogen burning) star of spectral type A. The spectral luminosity class is V. These stars have
A-type_main-sequence_star
Eye movement
amplitude ranges, the main sequence can best be modeled by an inverse power law function. The high peak velocities and the main sequence relationship can also
Saccade
Scatter plot of stars showing the relationship of luminosity to stellar classification
technique is known as main sequence fitting and is a type of spectroscopic parallax. Not only the turn-off in the main sequence can be used, but also
Hertzsprung–Russell_diagram
Planetary system consisting of the Sun and objects orbiting it
Sun fuses hydrogen at its core, it is a main-sequence star. More specifically, it is a G2-type main-sequence star, where the type designation refers to
Solar_System
Stellar core remnant
bright main sequence star 40 Eridani A, orbited at a distance by the closer binary system of the white dwarf 40 Eridani B and the main sequence red dwarf
White_dwarf
Changes to stars over their lifespans
settle down into a state of equilibrium, becoming what is known as a main-sequence star. Nuclear fusion powers a star for most of its existence. Initially
Stellar_evolution
Star of relatively small size and low luminosity
dwarf star is a star of relatively small size and low luminosity. All main-sequence stars are dwarf stars. The meaning of the word "dwarf" has been extended
Dwarf_star
References External links A-type main-sequence star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated
Glossary_of_astronomy
Rare star with tremendous luminosity and high rates of mass loss by stellar winds
type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants
Hypergiant
Stellar classification
black holes or neutron stars. Most of these stars are young massive main sequence, giant, or supergiant stars, but also some central stars of planetary
O-type_star
Hypothetical class of star that develops from a red dwarf
they are no longer main-sequence "dwarf" stars and become so-called white dwarfs – which, despite the name, are not main-sequence "dwarfs" and are not
Blue_dwarf_(red-dwarf_stage)
Region of a star
solar granulation. Low-mass main-sequence stars, such as red dwarfs below 0.35 solar masses, as well as pre-main sequence stars on the Hayashi track,
Convection_zone
Class of young variable stars
chromospheric lines. T Tauri stars are pre-main-sequence stars in the process of contracting to the main sequence along the Hayashi track, a luminosity–temperature
T_Tauri_star
Type of star larger than main-sequence but smaller than a giant
type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants
Subgiant
2005 collection of short stories by Robert A. Heinlein
Off the Main Sequence: The Other Science Fiction Stories of Robert A. Heinlein (ISBN 1-58288-184-7) is a collection of 27 short stories by American writer
Off_the_Main_Sequence
as the main sequence. Main-sequence stars derive energy from the fusion of hydrogen into helium in their cores. The Sun remains a main-sequence star today
Formation and evolution of the Solar System
Formation_and_evolution_of_the_Solar_System
Gravitational process studied in astronomy
nucleosynthesis and ejected as the stars pass beyond the end of their main sequence lifetime. Higher density regions of the interstellar medium form clouds
Star_formation
American-bred Thoroughbred racehorse
Main Sequence (foaled 13 February 2009) is a Kentucky-bred Thoroughbred racehorse. In his first three seasons he raced in Europe winning his first four
Main_Sequence_(horse)
Substellar object
than the biggest gas giant planets, but less than the least massive main-sequence stars. Their mass is approximately 13 to 80 times that of Jupiter (MJ)—not
Brown_dwarf
System of two stars orbiting each other
early A-type main-sequence star. KOI-81b is a 13,000 K white dwarf companion of KOI-81 (KIC 8823868), a 10,000 K late B-type main-sequence star. While
Binary_star
Young stars of spectral types A and B
A Herbig Ae/Be star (HAeBe) is a pre-main-sequence star – a young (<10 Myr) star of spectral types A or B. These stars are still embedded in gas-dust
Herbig_Ae/Be_star
Star whose brightness fluctuates, as seen from Earth
dust, it stabilizes in mass and becomes a pre–main-sequence star that is contracting toward the main sequence. The luminosity of this object is derived from
Variable_star
Astronomical measure
density per luminosity interval). The main sequence luminosity function maps the distribution of main sequence stars according to their luminosity. It
Luminosity function (astronomy)
Luminosity_function_(astronomy)
Creation of chemical elements within stars
constituent elements) over their lifespans, first by burning hydrogen (main sequence star), then helium (horizontal branch star), and progressively burning
Stellar_nucleosynthesis
Heterogeneous class of stars with unusual spectra
post-asymptotic giant branch stars that were similar to the Sun while on the main sequence, but have now ceased fusion and shed their atmospheres to reveal a bare
Wolf–Rayet_star
Hot, luminous star with a spectral type of A9 or earlier
type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants
Blue_supergiant
Type of star, larger and brighter than the Sun
type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants
Giant_star
Theoretical stellar remnant
elements like neon and magnesium. A white dwarf is what remains of a main sequence star of low or medium mass (below approximately 9 to 10 solar masses
Black_dwarf
Hot, giant star of early spectral type
type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants
Blue_giant
Stars with a supergiant luminosity class with a spectral type of K or M
type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants
Red_supergiant
Type of large cool star
type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants
Red_giant
Luminosity–temperature relationship in stars
relationship obeyed by infant stars of less than 3 M☉ in the pre-main-sequence phase (PMS phase) of stellar evolution. It is named after Japanese astrophysicist
Hayashi_track
Early stage in the process of star formation
infalling gas is depleted, leaving a pre-main-sequence star, which contracts to later become a main-sequence star at the onset of hydrogen fusion producing
Protostar
Constellation in the northern celestial hemisphere
blue-white main sequence star of spectral type B8 and apparent magnitude 9.16 around 3,900 AU distant from the primary, and a white main sequence star of
Perseus_(constellation)
Path taken by pre-main-sequence stars in the Hertzsprung–Russell diagram
The Henyey track is a path taken by pre-main-sequence stars with masses greater than 0.5 solar masses in the Hertzsprung–Russell diagram after the end
Henyey_track
Possible factors for life around red dwarf stars
also inhibit habitability. As red dwarf stars have an extended pre-main sequence phase, their eventual habitable zones would be for around 1 billion
Habitability of red dwarf systems
Habitability_of_red_dwarf_systems
Type of star that is massive and luminous
type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants
Supergiant
Constellation in the southern celestial hemisphere
system around 341 light-years distant that is composed of two blue-white main-sequence stars of spectral types B2V and B3V that orbit each other every 194 years
Musca
Orbits where planets may have liquid surface water
years on the main sequence, would have planets with ample time for life to develop and evolve. Even while stars are on the main sequence, though, their
Habitable_zone
Small number of stars that orbit each other
of this were found in the sample. Sirius, a binary consisting of a main-sequence type A star and a white dwarf Procyon, which is similar to Sirius Mira
Star_system
Portion of the giant branch before helium ignition
in the course of stellar evolution. It is a stage that follows the main sequence for low- to intermediate-mass stars. Red-giant-branch stars have an
Red-giant_branch
Region at the center of a star
extremely hot, dense region at the center of a star. For an ordinary main sequence star, the core region is the volume where the temperature and pressure
Stellar_core
White dwarf in the constellation Pisces
the main sequence for about 900 million years. This gives the star an overall age of about 4.1 billion years. When this star left the main sequence, it
Van_Maanen_2
Constellation in the northern celestial hemisphere
triple star system, the supergiant primary star having two yellow-white main-sequence star companions that are 17 and 2,400 astronomical units (AU) distant
Ursa_Minor
Star system in the Centaurus constellation
principal member, or primary, of the binary system. It is a solar-like main-sequence star with a similar yellowish colour, whose stellar classification is
Alpha_Centauri
Natural physical entity in space
It was found that stars commonly fell on a band of stars called the main-sequence stars on the diagram. A refined scheme for stellar classification was
Astronomical_object
Constellation in the northern celestial hemisphere
by 0.1 magnitude with a period of 17.4 days. The primary is a white main-sequence star of spectral type A0V that is 2.91 times the mass of the Sun (M☉)
Corona_Borealis
Known extent to which a planet is suitable for life
class of a star indicates its photospheric temperature, which (for main-sequence stars) correlates to overall mass. The appropriate spectral range for
Planetary_habitability
Spherical collection of stars
a "knee" in the H–R diagram called the main-sequence turnoff, bending to the upper right from the main-sequence line. The absolute magnitude at this bend
Globular_cluster
Constellation in the northern celestial hemisphere
map. The brightest star in the constellation is Vega (Alpha Lyrae), a main-sequence star of spectral type A0Va. Only 7.7 parsecs distant, Vega is a Delta
Lyra
Brightest star in Earth's night sky
Canopus, the next brightest star. Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf
Sirius
Central region of the Sun
needed] However, the Sun gradually becomes hotter during its time on the main sequence, because the helium atoms in the core are denser than the hydrogen atoms
Solar_core
Set of non-stellar objects in orbit around a star
pulsar PSR B1257+12. The first confirmed detection of exoplanets of a main-sequence star was made in 1995, when a giant planet, 51 Pegasi b, was found in
Planetary_system
Study of the movement of stars
origin of HVSs which are ejected from the galactic disk. Known HVSs are main-sequence stars with masses a few times that of the Sun. HVSs with smaller masses
Stellar_kinematics
Type of emission nebula created by dying red giants
inward pressures of gravity. This state of equilibrium is known as the main sequence, which can last for tens of millions to billions of years, depending
Planetary_nebula
Stars with distinctly unusual metal abundances
stars are common among hot main-sequence (hydrogen-burning) stars. These hot peculiar stars have been divided into four main classes on the basis of their
Chemically_peculiar_star
Main sequence star that is more luminous and bluer than expected
stellar cluster, they have a higher effective temperature than the main sequence turnoff point for the cluster, where ordinary stars begin to evolve
Blue_straggler
Star in its early stage of evolution
evolution. This class consists of two groups of objects: protostars and pre-main-sequence stars. A star forms by accumulation of material that falls in to a protostar
Young_stellar_object
Methods for estimating the age of a star
the star. This method only works for calculating stellar age on the main sequence, because in advanced evolutionary stages of the star, such as the red
Stellar_age_estimation
Region of a star
surfaces, at low enough temperatures where ionization is only partial. For main sequence stars—those stars that are generating energy through the thermonuclear
Radiative_zone
Constellation in the Southern Celestial Hemisphere
either a 3.2 million year-old very young pre-main sequence star that has not settled down to a stable main sequence life stage, or a 260-million-year-old star
Corvus_(constellation)
Constellation near the celestial equator
companion stars which orbit the supergiant: a B-type main sequence star and an F-type main sequence star. ε Aql (proper name is Arin-majlep since 18 June
Aquila_(constellation)
Constellation in the northern celestial hemisphere
ι And is a blue-white hued main-sequence star of type B8, 502 light-years from Earth; κ And is a white-hued main-sequence star of type B9 IVn, 168 light-years
Andromeda_(constellation)
Zodiac constellation in the northern hemisphere
B-type main sequence star before expanding and cooling to its current state as it spent its core hydrogen. The secondary is a white main sequence star of
Cancer_(constellation)
Constellation in the northern celestial hemisphere
afield is a binary system of two G-type main sequence stars, that would take 170,000 years to orbit the main pair if they are in fact related. Omicron
Pegasus_(constellation)
White dwarf star in the constellation Phoenix
main sequence star and as giant star) is 1.82 ± 0.06 Gyr. Gliese 518 should appear bluish-white, due temperature, comparable with that of A-type main
WD_2359−434
Constellation in the southern hemisphere
5 star Achernar, designated Alpha Eridani. It is a blue-white hued main sequence star 144 light-years from Earth, whose traditional name means "the river's
Eridanus_(constellation)
Triple star system in the constellation Scorpius
pre-main-sequence star. The primary star is a Beta Cephei variable star with rapid brightness changes of about a hundredth of a magnitude. The pre-main-sequence
Lambda_Scorpii
Measurement of radiant electromagnetic power emitted by an object
found above and to the right of the main sequence, more luminous or cooler than their equivalents on the main sequence. Increased luminosity at the same
Luminosity
Star that is particularly similar to the Sun
List of nearest stars and brown dwarfs Main sequence G-type main-sequence star Habitability of G-type main-sequence stars Planetary habitability Space colonization
Solar_analog
Flow of gas ejected from the upper atmosphere of a star
Different types of stars have different types of stellar winds. Post-main-sequence stars nearing the ends of their lives often eject large quantities of
Stellar_wind
Process where a red giant star engulfs a planet
Stellar engulfment is the process in which a star at the end of its main sequence phase of its life expands into a red giant star and engulfs some or
Stellar_engulfment
Class of massive star with a spectral type of A to K
enhanced, as expected for a post-main-sequence star. Yellow hypergiants have clearly evolved off the main sequence and so have depleted the hydrogen
Yellow_hypergiant
Super-Earth orbiting Kepler-442
exoplanet, likely rocky, orbiting within the habitable zone of the K-type main-sequence star Kepler-442, about 1,196 light-years (367 pc) from Earth in the
Kepler-442b
Nearest star to the Solar System
Proxima's relatively low energy-production rate, mean that it will be a main-sequence star for another four trillion years. Proxima Centauri has two known
Proxima_Centauri
Brief thermal runaway nuclear fusion in the core of low-mass stars
predicted to experience a flash 1.2 billion years after it leaves the main sequence. A much rarer runaway helium fusion process can also occur on the surface
Helium_flash
Type of supernova in binary systems
Once fusion begins, the temperature of the white dwarf increases. A main sequence star supported by thermal pressure can expand and cool which automatically
Type_Ia_supernova
Constellation in the northern celestial hemisphere
has exhausted the hydrogen at its core and has evolved away from the main sequence. The star has swollen to about 55 times the Sun's radius and is emitting
Lynx_(constellation)
Grouping of evolved cool luminous stars
burning), and a very large envelope of material of composition similar to main-sequence stars (except in the case of carbon stars). When a star exhausts the
Asymptotic_giant_branch
Story "Shadow Thieves"—appeared in Down These Strange Streets (2011) Main Sequence A Shadow of All Night Falling (1979) October's Baby (1980) All Darkness
Glen_Cook_bibliography
MAIN SEQUENCE
MAIN SEQUENCE
Surname or Lastname
Scottish
Scottish : Anglicized form of Gaelic Mac Iain, patronymic from Iain, one of the Gaelic forms of John. This name is found in many other spellings, including McCain, Kean, and McKean. In some cases it may also be a variant of Coyne.English : variant spelling of Cane.English (of Norman origin) : habitational name from Caen in Calvados, France, named with the Gaulish elements catu ‘battle’ + magos ‘field’, ‘plain’.French (Caïn) : from the Biblical name Cain (Hebrew Qayin), probably applied as a derogatory nickname for someone who was considered to be treacherous.Spanish (CaÃn) : habitational name from a place called CaÃn in León.
Female
English
Modern English name, either derived from from the vocabulary word, or a revival of the medieval English personal name Rayne, RAIN means "queen." Compare with masculine Rain.
Girl/Female
Indian
Proper name, Cloud that carries rain
Female
Greek
(Μαία) Greek name MAIA means "nursing mother." In mythology, this is the name of the eldest of the Pleiades and mother of Hermês by Zeus.Â
Male
German
German byname MANN means "a fierce strong man" or simply "man."
Female
Japanese
(舞) Japanese name MAI means "dance." Compare with another form of Mai.
Female
Swedish
Swedish contracted form of Latin Magdalena, MALIN means "of Magdala."
Male
Scottish
Variant spelling of Scottish Gaelic Ian, IAIN means "God is gracious."
Male
Hindi/Indian
(मणि) Hindi name MANI means "jewel." Compare with another form of Mani.
Boy/Male
Arabic, Hindu, Indian, Muslim, Sindhi
Cloud that Carries Rain; Prophet Name; Rain Clouds
Surname or Lastname
English
English : nickname from Middle English digne, deyne ‘worthy’, ‘honorable’, or alternatively, as Reaney suggests, from Middle English dain(e) ‘haughty’, ‘reserved’ (Burgundian French doigne).English : variant of Dean.English : variant of Dane.French : nickname from Old French dain ‘agile’, ‘nimble’.Jewish : variant of Dayan.
Boy/Male
Arabic, Muslim
Benefit
Surname or Lastname
English, German, Dutch (De Mann), and Jewish (Ashkenazic)
English, German, Dutch (De Mann), and Jewish (Ashkenazic) : nickname for a fierce or strong man, or for a man contrasted with a boy, from Middle English, Middle High German, Middle Dutch man. In some cases it may have arisen as an occupational name for a servant, from the medieval use of the term to describe a person of inferior social status. The Jewish surname can be ornamental.English and German : from a Germanic personal name, found in Old English as Manna. This originated either as a byname or else as a short form of a compound name containing this element, such as Hermann.Jewish (Ashkenazic) : from the Yiddish male personal name Man (cognate with 1).Indian (Panjab) : Hindu (Jat) and Sikh name of unknown meaning.
Male
French
French form of Roman Latin Marinus, MARIN means "of the sea."
Male
Hebrew
(×žÖ¸× Ö´×™) Pet form of Hebrew Menashsheh, MANI means "causing to forget" or "one who forgets." Compare with another form of Mani.
Female
Welsh
Welsh form of Greek Maria, MAIR means "obstinacy, rebelliousness" or "their rebellion."
Boy/Male
Muslim/Islamic
Cloud that carries rain
Female
Vietnamese
 Vietnamese name MAI means "golden flower." Compare with another form of Mai.
Surname or Lastname
Scottish and northern English
Scottish and northern English : topographic name for a dweller at the chief farm (or home farm) on an estate, Scottish mains, or a habitational name from any of the various minor places named with this word (originally a shortened form of domain, later associated with the adjective main ‘principal’).English and Scottish : variant of Main 1–4.
Girl/Female
French American Greek Hebrew Latin
May. In Roman mythology Maia: (source of the month May) was goddess of spring growth.
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Girl/Female
Australian, Danish, Dutch, Swedish
Pearl
Boy/Male
Muslim/Islamic
Worth deserving, merit
Boy/Male
Hindu
Arrow like
Girl/Female
Indian, Sanskrit
Intelligent; Wise
Girl/Female
Tamil
Pleasure of the earth, Flower
Boy/Male
Arabic, Muslim
Unfettered Camel; Lucky
Girl/Female
Assamese, Indian, Kannada, Marathi
Beloved
Girl/Female
Muslim
Virgin of Paradise. Nymph. (Note: Has pious meaning, not slovenly.).
Boy/Male
Christian & English(British/American/Australian)
Residence Name
Girl/Female
Arabic
Vacation
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MAIN SEQUENCE
v. i.
To have or receive advantage or profit; to acquire gain; to grow rich; to advance in interest, health, or happiness; to make progress; as, the sick man gains daily.
n.
That which comes in the mail; letters, etc., received through the post office.
n.
A married man; a husband; -- correlative to wife.
n.
To reach; to attain to; to arrive at; as, to gain the top of a mountain; to gain a good harbor.
a.
Very; extremely; as, main heavy.
n.
A main-hamper.
n.
To come off winner or victor in; to be successful in; to obtain by competition; as, to gain a battle; to gain a case at law; to gain a prize.
v.
The chief or principal part; the main or most important thing.
v. t.
To arm with mail.
n.
Vanity; emptiness; -- now used only in the phrase in vain.
n.
A beautiful American bombycid moth (Eucronia maia).
n.
A genus of spider crabs, including the common European species (Maia squinado).
n.
A man who has not had sexual intercourse.
v. t.
To bestow in a profuse or abundant manner; as, to rain favors upon a person.
v. t.
To pour or shower down from above, like rain from the clouds.
v.
principal duct or pipe, as distinguished from lesser ones; esp. (Engin.), a principal pipe leading to or from a reservoir; as, a fire main.
a.
So tight as to exclude rain; as, a rain-tight roof.
superl.
Destitute of forge or efficacy; effecting no purpose; fruitless; ineffectual; as, vain toil; a vain attempt.
v. t.
To deliver into the custody of the postoffice officials, or place in a government letter box, for transmission by mail; to post; as, to mail a letter.
n.
Any spider crab of the genus Maia, or family Maiadae.