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In the mathematical field of linear algebra, an arrowhead matrix is a square matrix containing zeros in all entries except for the first row, first column
Arrowhead_matrix
Topics referred to by the same term
Look up arrowhead in Wiktionary, the free dictionary. An arrowhead is the point of an arrow. Arrowhead or Arrow Head may also refer to: Arrowhead Range
Arrowhead_(disambiguation)
matrices used in mathematics, science and engineering. A matrix (plural matrices, or less commonly matrixes) is a rectangular array of numbers called entries
List_of_named_matrices
Multi-purpose indoor arena in Anaheim, California
Honda Center (formerly known as the Arrowhead Pond of Anaheim) is a multi-purpose indoor arena in Anaheim, California. The arena is home to the Anaheim
Honda_Center
List of current stadiums of the National Football League
Fame Game. The majority of NFL stadiums use naming rights. Only three — Arrowhead Stadium, Lambeau Field, and Soldier Field — do not currently use a corporate-sponsored
List_of_current_NFL_stadiums
General Motors 2000s compact car developed with Toyota
years 2002-2010. The Vibe was a badged engineered variant of the Toyota Matrix, jointly developed by General Motors and Toyota and manufactured at their
Pontiac_Vibe
Technique in photogrammetry and computer vision
Adjustment of observations Stereoscopy Levenberg–Marquardt algorithm Sparse matrix Collinearity equation Structure from motion Simultaneous localization and
Bundle_adjustment
Series of events that restore integrity to damaged tissue after an injury
collagen production, and matrix contraction (between day 4 and day 14) Endothelial cells and angiogenesis (begins on day 4) Dermal matrix: elements of fabrication
Wound_healing
Baseball stadium in Kansas City, Missouri
home of Major League Baseball's Kansas City Royals. It is next door to Arrowhead Stadium, home of National Football League's Kansas City Chiefs. Both make
Kauffman_Stadium
Australian actor
performance in the 2012 film Iron Sky. Other films he has appeared in include The Matrix Reloaded (2003) and Star Wars: Episode III – Revenge of the Sith (2005)
Christopher_Kirby
Diagram that represents a workflow or process
Description Flowline (arrowhead) Shows the process's order of operation. A line coming from one symbol and pointing at another. Arrowheads are added if the
Flowchart
Graphical representation for specifying business processes
associations. Sequence flow A sequence flow is represented with a solid line and arrowhead, and shows in which order the activities are performed. The sequence flow
Business Process Model and Notation
Business_Process_Model_and_Notation
February 6, 2026. Retrieved February 12, 2026. "Ciena Set to Join S&P 500; Arrowhead Pharmaceuticals to Join S&P MidCap 400; ADT and OneSpaWorld Holdings to
List_of_S&P_600_companies
Martian rock noted for its potential life signs
astrobiologists, the rock is on Step One, showing "possible signal" of life. The "arrowhead-shaped rock" was found at the northern edge of Neretva Vallis area, on
Cheyava_Falls
French multinational cosmetics and beauty company
Daughter Kérastase (created by L'Oreal in 1964) L’Oréal Professionnel Paris Matrix Haircare Mizani PulpRiot Hair Coloring Pureology Serious Color Care Redken
L'Oréal
American college football rivalry
for their football programs. They scheduled two neutral-site games at Arrowhead Stadium in Kansas City, Missouri in 2009 and 2010, which fans and the
Iowa State–Kansas State football rivalry
Iowa_State–Kansas_State_football_rivalry
American actor and stuntman (1937–2025)
stunt coordinator. Rondell died on August 12, 2025, at the age of 88, at Arrowhead Senior Living, an assisted living facility, in Osage Beach, Missouri.
Ronnie_Rondell_Jr.
Naturally occurring volcanic glass
because, like flint, it could be fractured to produce sharp blades or arrowheads in a process called knapping. Like all glass and some other naturally
Obsidian
Eukaryotes other than animals, plants or fungi
encased in hard cell walls (coccoid, like diatoms) or embedded in a mucilage matrix (capsalean, like glaucophytes); others are amoeboid, like the reticulose
Protist
American college football season
16 Colorado Buffaloes (8–2) at Kansas Jayhawks (4–6) – Game summary at Arrowhead Stadium • Kansas City, MO Date: November 23, 2024 Game time: 1:30 p.m
2024 Colorado Buffaloes football team
2024_Colorado_Buffaloes_football_team
also felt that The War Z was a clone of the popular Arma 2: Operation Arrowhead mod DayZ (of which a standalone version was in development); on June 20
List of video games notable for negative reception
List_of_video_games_notable_for_negative_reception
EA Black Box 3. Pokémon Ruby/Sapphire Game Freak Nintendo 4. Enter the Matrix Shiny Entertainment Infogrames 5. Tony Hawk's Underground Neversoft Activision
List of best-selling video games in the United States by year
List_of_best-selling_video_games_in_the_United_States_by_year
Stadium in Arlington, Texas
with standing room) Executive suites 380 Roof Retractable Surface Hellas Matrix Turf with Helix Soft Top artificial turf Record attendance List Football:
AT&T_Stadium
Object that reflects an image
there is a single mirror that is actively shielded by a liquid crystal matrix with up to millions of pixels. The picture, formed as light, is either reflected
Mirror
Games "The apex of the elytra declivity of this species is shaped like an arrowhead, Katniss' weapon of choice." Pseudotanais rapunzelae Błażewicz, Jakiel
List of organisms named after works of fiction
List_of_organisms_named_after_works_of_fiction
American wrestler and mixed martial arts fighter
original on August 25, 2007. Retrieved September 3, 2012. "Fight Matrix Awards". FightMatrix.com. Retrieved September 3, 2012. "MMA Fighting.com 2006 Year
Matt_Hughes_(fighter)
Japanese luxury vehicle brand owned by Toyota
derived from Japanese cultural motifs (e.g. the phrase kirikaeshi in arrowhead shapes). While earlier Lexus models were criticized for reserved and derivative
Lexus
Rebellion against Roman rule (66–73/74 CE)
with boulders and boiling oil—the earliest known use of this tactic. Arrowheads and ballista stones have been found at the site. When the city fell, the
First_Jewish–Roman_War
Material of a wide range of synthetic or semi-synthetic organic solids
needed] Additives may be weakly bound to the polymers or react in the polymer matrix. Although additives are blended into plastic they remain chemically distinct
Plastic
February 20, 2015 Ready at Dawn Helldivers PlayStation 3 March 3, 2015 Arrowhead Game Studios PSN PlayStation 4 PlayStation Vita Microsoft Windows December
List of Sony Interactive Entertainment video games
List_of_Sony_Interactive_Entertainment_video_games
History of Brazil before the arrival of Europeans (antiquity-1500)
In Santa Catarina and Rio Grande do Sul, artifacts (knives, scrapers, arrowheads) from 8,500 to 6,500 years ago have been located, established as the "Vinitu
Pre-Cabraline history of Brazil
Pre-Cabraline_history_of_Brazil
Group of microorganisms with two flagella
sp." presents the integrin-mediated adhesion machinery, the primary cell-matrix adhesion mechanism seen in Metazoa (animals). Apusomonads are a poorly and
Apusomonad
Swiss multinational pharmaceutical corporation
for $85 million. In addition, the company sold its RNAi portfolio to Arrowhead Research for $10 million and $25 million in stock. In June, the company
Novartis
"Ancient times table hidden in Chinese bamboo strips. The 2,300-year-old matrix is the world's oldest decimal multiplication table". Nature. doi:10.1038/nature
History_of_China
American animated television series
season, the Freemakers join the Rebel Alliance and attempt to build the Arrowhead, a kyber crystal-powered ship which Rowan saw in a vision and is supposedly
Lego Star Wars: The Freemaker Adventures
Lego_Star_Wars:_The_Freemaker_Adventures
Springs: The Thrilling Steamy Maze Kiwami WIN, iOS, DROID, NS, PS5 RPG Matrix Software FuRyu January 19 Another Code: Recollection NS PCA Arc System Works
List of video games released in 2024
List_of_video_games_released_in_2024
Latin phrase that translates literally to 'on site'
(DC) sensor arrays. These systems detect structural degradation, including matrix discontinuities, interlaminar delaminations, and fiber fractures, by analyzing
In_situ
Mixture or metallic solid solution composed of two or more elements
nails. In many cultures it was shaped by cold hammering into knives and arrowheads. They were often used as anvils. Meteoric iron was very rare and valuable
Alloy
series Tetris: The Grand Master series Tetris 99 Pac-Man 99 Tekken 8 Arrowhead Game Studios Skellefteå Sweden 2008 Helldivers series Arkadium New York
List_of_video_game_developers
Swiss pharmaceutical company
PLUS Weeties Former brands and subsidiaries Alcon Alfasigma Animal Bar Arrowhead Butterfinger Baby Ruth Chocolate Surpresa Deer Park Dreyer's15 Enviga
Galderma
Flat panel display technology
phosphor to produce a color image. In a general sense, an FED consists of a matrix of cathode-ray tubes, each tube producing a single sub-pixel, grouped in
Field-emission_display
Electro-mechanical data storage device
have only one magnet). The voice coil itself is shaped rather like an arrowhead and is made of doubly coated copper magnet wire. The inner layer is insulation
Hard_disk_drive
Photosynthetic part of a vascular plant
and broader than long. Rounded Curving shape. Sagittate Shaped like an arrowhead and with the acute basal lobes pointing downward. Truncate Ending abruptly
Leaf
products of metallurgists were items for military and hunting purposes: arrowheads, spears, axes, knives, and fishhooks. From the beginning of the second
History of metallurgy in the Urals
History_of_metallurgy_in_the_Urals
Annual video game award ceremony
Studios) Console Game of the Year Helldivers 2 (Arrowhead Game Studios) Critics' Choice Helldivers 2 (Arrowhead Game Studios) Most Wanted Game Grand Theft
Golden_Joystick_Awards
Topics referred to by the same term
organization Antar Lintas Sumatera, an Indonesian intercity bus company Arrowhead Library System (Wisconsin), American public libraries Australian Linguistic
ALS_(disambiguation)
Species of fungus
In the maturation step, the biofilm biomass expands, the extracellular matrix accumulates and drug resistance increases. In the last step of biofilm formation
Candida_albicans
Baseball park in Anaheim, California
located less than 3 miles (4.8 km) east of Disneyland and across from the Arrowhead Pond, the home venue of the then Disney-owned Mighty Ducks of Anaheim)
Angel_Stadium
Extremely small fragments of plastic
and personal care products. The sorption potential is affected by water matrix, pH, ionic strength and aging of microparticles. Additives added to plastics
Microplastics
Genus of bilaterians with a simple body plan
the "subepidermal membrane complex", a major part of the extracellular matrix. The multiciliate epidermis displays unique interconnected ciliary rootlets
Xenoturbella
Tiling puzzle
premium for Mohawk Rugs & Carpets features the challenge of making an arrowhead with the same pieces. In the same year a giveaway for Eberhard Faber's
T_puzzle
Ancient causeway in the Somerset Levels, England
spoon fragment. Finds made from other materials, such as flint flakes, arrowheads, and a chipped flint axe (in mint condition) have also been made. A geophysical
Sweet_Track
Visualization of node-link graphs
among sets of metaphysical concepts. In the case of directed graphs, arrowheads form a commonly used graphical convention to show their orientation; however
Graph_drawing
Lizard Software, Wizards of the Coast Wizards of the Coast Magicka 2011 Arrowhead Game Studios Paradox Interactive Magna Carta: The Phantom of Avalanche
Index_of_Windows_games_(M)
Former amphitheatre in Irvine, California
well as the annual KROQ Weenie Roast. Because of the 1993 opening of the Arrowhead Pond of Anaheim (now Honda Center), Irvine Meadows increasingly became
Irvine_Meadows_Amphitheatre
Craft of making objects from clay
pottery for the storage of wild cereals (pearl millet), and that of small arrowheads for hunting small game typical of grassland. Alternatively, the creation
Pottery
Artistic technique
pictures that normally are flush with the matrix. A great range of materials have been used both for the base or matrix and for the inlays inserted into it
Inlay
Statistical term
rule is that you can never pass out of one arrow head and into another arrowhead: tails-tails, heads-tails, or tails-heads, but not heads-heads. You can
Path_analysis_(statistics)
2010 video game
computer wargame developed and by Panther Games in Australia and published by Matrix Games in 2010. The game is set around the historical WWII Western Front
Command Ops: Battles from the Bulge
Command_Ops:_Battles_from_the_Bulge
Interactive Arma 2 2009-06-26 WIN Bohemia Interactive Arma 2: Operation Arrowhead 2010-06-29 WIN Bohemia Interactive Arma: Cold War Assault 2011-06-22 WIN
List_of_first-person_shooters
American football player (born 1996)
undefeated 2017 team that was selected as national champions by the Colley Matrix. Wright signed with the Pittsburgh Steelers as an undrafted free agent in
Matthew Wright (American football)
Matthew_Wright_(American_football)
Very large iron meteorite from Greenland
a medieval Norse farm in the modern day Nuuk area in 1976 revealed an arrowhead made of iron from the meteorite. Its presence is evidence of the connections
Cape_York_meteorite
Former arena in California, United States
down an agreement to re-locate the franchise permanently to Anaheim's Arrowhead Pond (now Honda Center) in 1996, the Coliseum Commission had discussions
Los Angeles Memorial Sports Arena
Los_Angeles_Memorial_Sports_Arena
Ski resort in Montana, United States
terrain. Construction was completed by the high-altitude construction firm Matrix, based in Alaska. Beginning in the summer 2012 season, Big Sky introduced
Big_Sky_Resort
Species of bacterium
straightforward identification. GBS can also be identified using MALDI-TOF (Matrix Assisted Laser Desorption/Ionization-Time of Flight) instruments. GBS colonies
Streptococcus_agalactiae
{ 1 , 2 , 3 , 4 , 5 } {\displaystyle N_{G}=\{1,2,3,4,5\}} and adjacency matrix A G = ( 0 1 1 0 0 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 0 0 ) {\displaystyle
Fibration_symmetry
Algebraic structure associated with a topological space
the number of "holes" in X at dimension n. It may be computed by putting matrix representations of these boundary mappings in Smith normal form. Using simplicial
Homology_(mathematics)
Mortal Kombat games List of Atari, Inc. games Sesame Street video games "The Matrix Online". GameSpy. Retrieved 2013-01-15. "Friends: The One With All The Trivia -
List of Warner Bros. Games video games
List_of_Warner_Bros._Games_video_games
Choice of reference for distinguishing an object and its mirror image
parallel to it, an orientation given by its sense (often indicated by an arrowhead) and a magnitude given by its length. Similarly, a bivector in three dimensions
Orientation_(vector_space)
History of the municipality of Francavilla Fontana, Italy
technical and industrial activity. Moreover, given the rarity of knives, arrowheads and agricultural implements uncovered, it was assumed that life must have
History of Francavilla Fontana
History_of_Francavilla_Fontana
Unreleased Nov 26, 2019 Nov 26, 2019 Gauntlet: Slayer Edition Hack and slash Arrowhead Studios WB Games Unreleased Aug 11, 2015 Aug 11, 2015 Gekido: Kintaro's
List of PlayStation 4 games (A–L)
List_of_PlayStation_4_games_(A–L)
British documentary series about UK archaeology
and David Savage, call-in expert Stuart Prior) Recreation of medieval arrowhead (smith Hector Cole, reporting Stuart Prior) An Iron Age banjo enclosure
Digging_for_Britain
Prehistoric culture in Upper Egypt
Tools included end-scrapers, axes, bifacial sickles and concave-base arrowheads. Social stratification has been inferred from the burying of more prosperous
Badarian_culture
Analytical chemistry Aneutronic fusion Antiproton Decelerator Apache Arrowhead Apache Point Observatory Lunar Laser-ranging Operation Arago spot Argon
List_of_laser_articles
City in Ohio, United States
city is one of the largest business centers in Northwest Ohio. Together, Arrowhead Business Park and Maumee's historic business community contribute to the
Maumee,_Ohio
American football team of the University of Kansas
AP and coaches polls. November 24, 2007: Kansas and Missouri played in Arrowhead Stadium. The Jayhawks were ranked 2nd and Missouri was ranked 3rd, the
Kansas_Jayhawks_football
shooter Bohemia Interactive Microsoft Windows 2009 ARMA 2: Operation Arrowhead Tactical shooter Bohemia Interactive Microsoft Windows 2010 Armored Core
List_of_505_video_games
chondroclasts tend to exhibit an undifferentiated surface adjacent to the matrix, which is structurally indistinguishable from the basolateral plasma membrane
Chondroclast
bulat) Obsidian, used by Native Americans for knives, spearheads, and arrowheads. This natural glass chips sharper than other stones but is more brittle
List_of_blade_materials
Anteater Stadium 2,500 Irvine California UC Irvine Anteaters Grass 2000 Arrowhead Stadium 79,451 Kansas City Missouri Formerly Kansas City Wizards 2026
List of soccer stadiums in the United States
List_of_soccer_stadiums_in_the_United_States
Shield volcano in Oregon, United States
mountain's caldera was used to harvest obsidian, which they used to sharpen arrowheads and tools and traded throughout the Pacific Coast region for several thousand
Newberry_Volcano
Interstitial cells
However, fibroblasts have the function of generating connective tissue matrix, specifically, collagen. The distinction between TC and fibroblasts is obvious
Telocyte
Mayhem 2017 Volition Deep Silver AGEOD's American Civil War 2007 AGEOD Matrix Games Ageod's Wars of Succession 2018 AGEOD Slitherine Ltd Agharta: The
Index_of_Windows_games_(A)
International standard for 7-bit ASCII and national modifications
and circumflex (rather than quotation marks, a comma, and an upward arrowhead), respectively, when preceded or followed by a backspace. The current
ISO/IEC_646
Canadian aerospace company (1945–1962)
ISBN 1-896522-83-1. Page, Ron, Richard Organ, Don Watson and Les Wilkinson (The "Arrowheads"). Avro Arrow: The Story of the Avro Arrow from its Evolution to its Extinction
Avro_Canada
Brand of AMD video card products
The short list includes titles such as Age of Conan, ARMA 2: Operation Arrowhead, S.T.A.L.K.E.R.: Call of Pripyat, Serious Sam 3: BFE, Singularity, Sleeping
AMD_Eyefinity
Pictorial computational technique in quantum chemistry
labelled next to the arrows to refer to a specific angular momentum state, arrowheads are almost always placed at the middle of the line, rather than at the
Angular momentum diagrams (quantum mechanics)
Angular_momentum_diagrams_(quantum_mechanics)
Medical condition
differentiate into Multinucleated Giant Cells after prolonged activation. Secreted matrix metalloproteinases degrade collagen and fuel necrobiosis in response to
Necrobiosis_lipoidica
Acid-fast stain, Giemsa stain, India ink stain, Ziehl–Neelsen stain. MALDI-TOF (Matrix-assisted laser desorption/ionization - time of flight) is a specific type
Diagnostic_microbiology
Market town in Bedfordshire, England
around Biggleswade is thought to have been inhabited from about 10,000 BC. Arrowheads believed to be from this time have been found. Sherds of late Neolithic
Biggleswade
Term defining human-built architecture
Archaeological section Cut (archaeology) Excavation Fill (archaeology) Harris matrix Relationship (archaeology) Single context recording Emery, Katy Meyers (4
Feature_(archaeology)
a bronze tip and iron shaft, until the end of the Han when the entire arrowhead was made solely of iron. Farmers, carpenters, craftsmen, stonemasons,
Science and technology of the Han dynasty
Science_and_technology_of_the_Han_dynasty
F.A.K.K. 2 Ritual Entertainment LIN, MAC, WIN 2000-08-02 Helldivers 2 Arrowhead Game Studios WIN, PS5 2024-02-08 Heretic II Raven Software AMI, LIN, MAC
List_of_third-person_shooters
British TV series or programme
Episode 14: Arrowhead – (Original Air Date: 5 January 2017) Summary: Great Aunt Lizzie tells the story of Charlotte and the Mayan Hunter's Arrowhead. A farm
Teacup_Travels
Infection by Streptococcus agalactiae
identification. Identification of GBS could also be carried out easily using matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry
Group B streptococcal infection
Group_B_streptococcal_infection
Any life form too small for the naked human eye to see that lives in a marine environment
to form floating colonies, where hundreds of cells are embedded in a gel matrix, which can increase massively in size during blooms. As a result, Phaeocystis
Marine_microorganisms
Caithness' island in Pentland Firth off the north coast of Scotland
18th-century inhabitants of the island collected the prehistoric stone arrowheads that they found on the western side of the island, believing them to be
Stroma,_Scotland
– 2005 Anderson Field – Grandview Heights HS – Columbus, Ohio – 2007 Arrowhead Stadium – Girard HS – Girard, Ohio – 2008 Avon Stadium – Avon HS – Avon
List of FieldTurf installations
List_of_FieldTurf_installations
Pre-historic to modern history of Rio Grande do Sul
well as personal adornments and lithic artifacts such as chipped stone arrowheads and spears, bolas, cutters, scrapers, and other tools. Their culture predominated
History_of_Rio_Grande_do_Sul
Annual award presented by the Academy of Interactive Arts & Sciences
Entertainment: Insomniac Games developed Marvel's Spider-Man 2 (2024) Arrowhead Game Studios developed Helldivers 2 (2025) There have also been two back-to-back
D.I.C.E. Award for Action Game of the Year
D.I.C.E._Award_for_Action_Game_of_the_Year
ARROWHEAD MATRIX
ARROWHEAD MATRIX
Surname or Lastname
English
English : probably an occupational name for a maker of arrowheads, from an agent derivative of Middle English tippe ‘tip’, ‘head’. On the other hand it may possibly be a bawdy nickname from an agent derivative of Middle English t̄pe(n) ‘to knock over’ (of obscure origin; here with a sexually suggestive sense). The same name has been established in Ireland, in County Kildare, since the beginning of the 14th century.German : topographic name from a Westphalian field name, Tippe, of unexplained etymology.
Surname or Lastname
English
English : occupational name for a maker of iron arrowheads, from Old English arwe ‘arrow’ + smi{dh} ‘smith’.
ARROWHEAD MATRIX
ARROWHEAD MATRIX
Girl/Female
Arabic, Muslim
Very Thankful
Girl/Female
Hindu
Spiritual, Sacred, Divine
Girl/Female
Tamil
Madhu Bindu | மத௠பிஂதà¯Â
Drop of Honey
Surname or Lastname
English
English : variant spelling of Hinckley.
Boy/Male
American, Anglo, Australian, British, English, German, Jamaican
Battle Protector; Fighter; Warrior
Girl/Female
Australian, French
To Sing; Stony Spot; Place Name
Girl/Female
Australian, Danish, French, Greek, Japanese
Peace
Boy/Male
Greek
Helps Odysseus return home.
Girl/Female
Greek
Light.
Surname or Lastname
English (rare; mainly northeastern)
English (rare; mainly northeastern) : variant of Longwell.
ARROWHEAD MATRIX
ARROWHEAD MATRIX
ARROWHEAD MATRIX
ARROWHEAD MATRIX
ARROWHEAD MATRIX
n.
Hence, that which gives form or origin to anything
n.
An aquatic plant of the genus Sagittaria, esp. S. sagittifolia, -- named from the shape of the leaves.
n.
The lifeless portion of tissue, either animal or vegetable, situated between the cells; the intercellular substance.
a.
Shaped like an arrowhead; triangular, with the two basal angles prolonged downward.
n.
The head of an arrow.
v. t.
The white fibrous matter forming the matrix from which fungi.
n.
An herbaceous grasslike plant (Triglochin palustre, and other species) with pods opening so as to suggest barbed arrowheads.
n.
The point of a spear, or an arrowhead.
n.
The cavity in which anything is formed, and which gives it shape; a die; a mold, as for the face of a type.
n.
Carved work, somewhat resembling an anchor or arrowhead; -- a part of the ornaments of certain moldings. It is seen in the echinus, or egg-and-anchor (called also egg-and-dart, egg-and-tongue) ornament.
n.
See Matrix.
n.
The amorphous or homogenous matrix or ground mass, as distinguished from well-defined crystals; as, the magma of porphyry.
n.
The womb.
n.
The five simple colors, black, white, blue, red, and yellow, of which all the rest are composed.
a.
Shaped like the head of an arrow; cuneiform.
a.
Wedge-shaped; as, a cuneiform bone; -- especially applied to the wedge-shaped or arrowheaded characters of ancient Persian and Assyrian inscriptions. See Arrowheaded.
n.
A rectangular arrangement of symbols in rows and columns. The symbols may express quantities or operations.
n.
The earthy or stony substance in which metallic ores or crystallized minerals are found; the gangue.
pl.
of Matrix
n.
The edible tuber of a species of arrowhead (Sagittaria variabilis); -- so called by the Indians of Oregon.