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Geometric construct
In mathematics a Dirac structure is a geometric structure generalizing both symplectic structures and Poisson structures, and having several applications
Dirac_structure
Relativistic quantum mechanical wave equation
In particle physics, the Dirac equation is a relativistic wave equation derived by British physicist Paul Dirac in 1928. In its free form, or including
Dirac_equation
Generalized function whose value is zero everywhere except at zero
In mathematical analysis, the Dirac delta function (or δ {\displaystyle {\boldsymbol {\delta }}} distribution), also known as the unit impulse, is a generalized
Dirac_delta_function
Quantum effect in some non-metals
In physics, Dirac cones are features that occur in some electronic band structures that describe unusual electron transport properties of materials like
Dirac_cone
Generators of the Clifford algebra for relativistic quantum mechanics
\left\{\gamma ^{0},\gamma ^{1},\gamma ^{2},\gamma ^{3}\right\}\ ,} also called the Dirac matrices, are a set of conventional matrices with specific anticommutation
Gamma_matrices
British physicist (1902–1984)
Paul Adrien Maurice Dirac (/dɪ.ˈræk/, dih-RAK; 8 August 1902 – 20 October 1984) was a British theoretical physicist who is considered to be one of the
Paul_Dirac
Dimensionless number that quantifies the strength of the electromagnetic interaction
the splitting or fine-structure of the hydrogenic spectral lines. This constant was not seen as significant until Paul Dirac's linear relativistic wave
Fine-structure_constant
Hypothesis relating age of the universe to physical constants
The Dirac large numbers hypothesis (LNH) is an observation made by Paul Dirac in 1937 relating ratios of size scales in the Universe to that of force
Dirac large numbers hypothesis
Dirac_large_numbers_hypothesis
Physical constant in quantum mechanics
and Dirac again introduced special symbols for it: K {\textstyle K} in the case of Schrödinger, and h {\textstyle h} in the case of Dirac. Dirac continued
Planck_constant
Notation for quantum states
Bra–ket notation or Dirac notation is a mathematical notation for linear algebra and linear operators on complex vector spaces together with their dual
Bra–ket_notation
Prize awarded by the International Centre for Theoretical Physics
The Dirac Medal of the ICTP is given each year by the International Centre for Theoretical Physics (ICTP) in honour of physicist Paul Dirac. The award
Dirac_Medal_(ICTP)
Concept in differential geometry
product of split signature, a generalized complex structure L → M {\displaystyle L\to M} is a Dirac structure in the complexified Courant algebroid with the
Courant_algebroid
Condensed matter system
term Dirac matter refers to a class of condensed matter systems which can be effectively described by the Dirac equation. Even though the Dirac equation
Dirac_matter
Description of a quantum-mechanical system
unviable. This was fixed by Dirac by taking the so-called square root of the Klein–Gordon operator and in turn introducing Dirac matrices. In a modern context
Schrödinger_equation
Theoretical model of the vacuum
The Dirac sea is a theoretical model of the electron vacuum as an infinite sea of electrons with negative energy. It was first postulated by the British
Dirac_sea
Mathematical structure in differential geometry
):=\{\pi (\alpha ,\cdot )+\alpha \}\subset TM\oplus T^{*}M} defines a Dirac structure, i.e. a Lagrangian subbundle of T M ⊕ T ∗ M {\displaystyle TM\oplus
Poisson_manifold
Hypothetical particle with one magnetic pole
magnetic charge started with a paper by the physicist Paul Dirac in 1931. In this paper, Dirac showed that if any magnetic monopoles exist in the universe
Magnetic_monopole
First-order differential linear operator on spinor bundle, whose square is the Laplacian
In mathematics and in quantum mechanics, a Dirac operator is a first-order differential operator that is a formal square root, or half-iterate, of a second-order
Dirac_operator
Ab initio quantum chemistry program
Dirac (named after Paul Dirac; own notation DIRAC) is a relativistic ab initio quantum chemistry program. The full name is Program for Atomic and Molecular
Dirac_(software)
Formulation of quantum mechanics on a Hilbert Space
In mathematical physics, the Dirac–von Neumann axioms give a mathematical formulation of quantum mechanics in terms of operators on a Hilbert space. They
Dirac–von_Neumann_axioms
It is a generalization of the Lie bracket from an operation on the tangent bundle
bracket. Dirac structures include as special cases symplectic structures, Poisson structures and foliated geometries. A generalized complex structure is defined
Courant_bracket
Concept in differential geometry
as the index of a Dirac operator – a Dirac operator is a square root of a second order operator, and exists due to the spin structure being a "square root"
Spin_structure
Spectrum of eigenvalues
mathematics, a Dirac spectrum, named after Paul Dirac, is the spectrum of eigenvalues of a Dirac operator on a Riemannian manifold with a spin structure. The isospectral
Dirac_spectrum
Dirac equation for self-interacting fermions
notation. In quantum field theory, the nonlinear Dirac equation is a model of self-interacting Dirac fermions. This model is widely considered in quantum
Nonlinear_Dirac_equation
Quantum field theory equations
context of Dirac's constraint dynamics and relativistic mechanics and quantum mechanics. Their structures, unlike the more familiar two-body Dirac equation
Two-body_Dirac_equations
Class of fermionic quasiparticles
exotic electronic structure can emerge at the critical point of a topological phase transition from semimetal to insulator wherein two Dirac cones coalesce
Semi-Dirac_fermion
Mathematical description of fermions
In physics, and specifically in quantum field theory, a Dirac spinor is a mathematical construction that is used to describe some of the fundamental particles
Dirac_spinor
Type of structure in atomic physics
difficulty by working with the relativistic Dirac wave equation, according to which the mediating field for the Dirac spinors is the four-vector potential (V
Hyperfine_structure
Geometric analogue of the Dirac equation
geometric structure gives the equation a natural discretization that is equivalent to the staggered fermion formalism in lattice field theory, making Dirac–Kähler
Dirac–Kähler_equation
Describes the range of energies of an electron within the solid
In solid-state physics, the electronic band structure (or simply band structure) of a solid describes the range of energy levels that electrons may have
Electronic_band_structure
Type of subatomic particle
particle physics, a fermion is a subatomic particle that follows Fermi–Dirac statistics. Fermions have a half-integer spin (spin 1/2, spin 3/2, etc
Fermion
Details in the emission spectrum of an atom
can also be obtained from the non-relativistic limit of the Dirac equation, since Dirac's theory naturally incorporates relativity and spin interactions
Fine_structure
Something that has mass and volume
of matter. In particle physics, fermions are particles that obey Fermi–Dirac statistics. Fermions can be elementary, like the electron—or composite,
Matter
Austrian–Irish physicist (1887–1961)
entanglement" in 1935. Schrödinger shared the 1933 Nobel Prize in Physics with Paul Dirac "for the discovery of new productive forms of atomic theory". In addition
Erwin_Schrödinger
Hexagonal lattice made of carbon atoms
understanding the electronic properties of 3D graphite. The emergent massless Dirac equation was separately pointed out in 1984 by Gordon Walter Semenoff, and
Graphene
is the study of Dirac operators, and Dirac type operators in analysis and geometry, together with their applications. Examples of Dirac type operators
Clifford_analysis
Chemistry based on quantum physics
quantum chemical problem is usually solving the Schrödinger equation (or Dirac equation in relativistic quantum chemistry) with the electronic molecular
Quantum_chemistry
Material composed of antiparticles
The modern theory of antimatter began in 1928, with a paper by Paul Dirac. Dirac realised that his relativistic version of the Schrödinger wave equation
Antimatter
Graphene is a semimetal whose conduction and valence bands meet at the Dirac points, which are six locations in momentum space, the vertices of its hexagonal
Electronic properties of graphene
Electronic_properties_of_graphene
Quantum mechanics taking into account particles near or at the speed of light
spin-1/2 fermions, fine structure, and quantum dynamics of charged particles in electromagnetic fields. The key result is the Dirac equation, from which
Relativistic quantum mechanics
Relativistic_quantum_mechanics
Prize awarded by the Institute of Physics
The Paul Dirac Medal and Prize is a gold medal awarded annually by the Institute of Physics (Britain's and Ireland's main professional body for physicists)
Dirac_Medal_(IOP)
Quantum field theory of electromagnetism
theory describing radiation and matter interaction is attributed to Paul Dirac, who during the 1920s computed the coefficient of spontaneous emission of
Quantum_electrodynamics
Geometric structure
(2000), Dirac Operators in Riemannian Geometry, American Mathematical Society, ISBN 978-0-8218-2055-1 page 53 Friedrich, Thomas (2000), Dirac Operators
Spinor_bundle
Quantity in solid state thermodynamics
it generally provides correct results when applied correctly. The Fermi–Dirac distribution, f ( ϵ ) {\displaystyle f(\epsilon )} , gives the probability
Fermi_level
Astrophysical models for the formation of galaxies and clusters of galaxies
, where δ ( 3 ) {\displaystyle \delta ^{(3)}} is the three-dimensional Dirac delta function and k = | k | {\displaystyle k=|\mathbf {k} |} is the length
Structure_formation
Theoretical framework in physics
Louis de Broglie, Werner Heisenberg, Max Born, Erwin Schrödinger, Paul Dirac, and Wolfgang Pauli. In the same year as his paper on the photoelectric
Quantum_field_theory
Mathematical description in crystallography
static structure factor (or structure factor for short) is a mathematical description of how a material scatters incident radiation. The structure factor
Structure_factor
Association of chemists
Medal to one "outstanding theoretical and computational chemist", and the Dirac Medal to one "outstanding theoretical and computational chemist under the
World Association of Theoretical and Computational Chemists
World_Association_of_Theoretical_and_Computational_Chemists
Elementary particle with negative charge
In 1928, building on Wolfgang Pauli's work, Paul Dirac produced a model of the electron – the Dirac equation, consistent with relativity theory, by applying
Electron
Allotrope of carbon
specific applications owing to its particular energy structure, namely direction-dependent Dirac cones. The directional dependency of 6,6,12-graphyne
Graphyne
Field theory in physics that aims to unify the fundamental forces and particles
field theory. By 1930 Einstein had already considered the Einstein-Maxwell–Dirac System [Dongen]. This system is (heuristically) the super-classical [Varadarajan]
Unified_field_theory
Term used in quantum mechanics
function of the electrons at the energy level of E is presented by a Fermi–Dirac distribution function. In this case the Fermi level is defined as the level
Quasi_Fermi_level
Description of physical properties at the atomic and subatomic scale
mid-1920s by Niels Bohr, Erwin Schrödinger, Werner Heisenberg, Max Born, Paul Dirac and others. The modern theory is formulated in various specially developed
Quantum_mechanics
Quantization method for constrained Hamiltonian systems with second-class constraints
The Dirac bracket is a generalization of the Poisson bracket developed by Paul Dirac to treat classical systems with second class constraints in Hamiltonian
Dirac_bracket
Type of field-effect transistor
more accurate model considers the effect of thermal energy on the Fermi–Dirac distribution of electron energies which allow some of the more energetic
MOSFET
Fermion that is its own antiparticle
by Ettore Majorana in 1937. The term is sometimes used in opposition to Dirac fermion, which describes fermions that are not their own antiparticles.
Majorana_fermion
Austrian–Swiss physicist (1900–1958)
sometimes said to have influenced Paul Dirac in his creation of the Dirac equation for the relativistic electron, though Dirac said that he invented these same
Wolfgang_Pauli
Elementary particle or quantum of light
numbers) are zero. Also, photons obey Bose–Einstein statistics, and not Fermi–Dirac statistics. That is, they do not obey the Pauli exclusion principle, and
Photon
Existence of a line through two points
proving that t 2 ( n ) ≥ n {\displaystyle t_{2}(n)\geq {\sqrt {n}}} . Gabriel Dirac (1951) conjectured that t 2 ≥ ⌊ n / 2 ⌋ {\displaystyle t_{2}\geq \lfloor
Sylvester–Gallai_theorem
Spin of an electron
from the Dirac equation, a fundamental equation connecting the electron's spin with its electromagnetic properties. Reduction of the Dirac equation for
Electron_magnetic_moment
Putting fermions on a lattice with chiral symmetry results in more fermions than expected
resulting in more fermionic states than expected. For the naively discretized Dirac fermions in d {\displaystyle d} Euclidean dimensions, each fermionic field
Fermion_doubling
Process in quantum mechanical theories
Poisson brackets, a structure which is only partially preserved in canonical quantization. This method was further used by Paul Dirac in the context of
Canonical_quantization
Periodic table of the elements with eight or more periods
the relativistic Dirac equation runs into problems with electron orbitals at Z > 1/α ≈ 137.036 (the reciprocal of the fine-structure constant), suggesting
Extended_periodic_table
British theoretical physicist (born 1953)
awarded the Dirac Prize of the Institute of Physics in 1998, and the Edge of Computation Science Prize in 2005. In 2017, he received the Dirac Medal of the
David_Deutsch
Path in a graph that visits each vertex exactly once
Bondy–Chvátal theorem, which generalizes earlier results by G. A. Dirac (1952) and Øystein Ore. Both Dirac's and Ore's theorems can also be derived from Pósa's theorem
Hamiltonian_path
British mathematical physicist (1889–1944)
Chandrasekhar, Paul Dirac, Homi J. Bhabha, and Sir William McCrea. It was Fowler who introduced Dirac to quantum theory in 1923. Fowler also put Dirac and Werner
Ralph_Fowler
Physics principle formulated by Niels Bohr
classical–quantum correspondence. Dirac connected the structures of classical mechanics known as Poisson brackets to analogous structures of quantum mechanics known
Correspondence_principle
Fundamental object of geometry
electromagnetism, where electrons are idealized as points with non-zero charge). The Dirac delta function, or δ function, is (informally) a generalized function on
Point_(geometry)
Atom of the element hydrogen
correct expression for the fine structure of hydrogen spectra (which happens to be exactly the same as in the most elaborate Dirac theory). However, some observed
Hydrogen_atom
Intrinsic quantum property of particles
the Dirac equation, rather than being a more nearly physical quantity, like orbital angular momentum L). Nevertheless, spin appears in the Dirac equation
Spin_(physics)
Special tangential structure
spinc structure defines two complex plane bundles, which can be used to describe negative and positive chirality of spinors, for example in the Dirac equation
Spinc_structure
Non-mainstream theory in physics
theorem. In 1937, Paul Dirac and others began investigating the consequences of natural constants changing with time. For example, Dirac proposed a change
Variable_speed_of_light
Type of Riemannian manifold
) {\displaystyle (M,g)} endowed with three integrable almost complex structures I , J , K {\displaystyle I,J,K} that are Kähler with respect to the Riemannian
Hyperkähler_manifold
Indian-American physicist (1910–1995)
absorption coefficients, and model stellar photospheres. On the advice of Paul Dirac, he spent his final year of graduate studies (September 1932 to May 1933)
Subrahmanyan_Chandrasekhar
Lowest possible energy of a quantum system or field
and others, Paul Dirac's theory of emission and absorption (1927) was the first application of the quantum theory of radiation. Dirac's work was seen as
Zero-point_energy
State of matter
A fermionic condensate (or Fermi–Dirac condensate) is a superfluid phase formed by fermionic particles at low temperatures. It is closely related to the
Fermionic_condensate
Symmetry of physical laws under a charge-conjugation transformation
important equations and theoretical systems, including the Dirac equation and the structure of quantum field theory. The various fundamental particles
C-symmetry
1957 novel by Eric Frank Russell
mockingly registers the rebel organisation Dirac Angestun Gesept as a legitimate organisation: Title of organization: Dirac Angestun Gesept. Purpose of organization:
Wasp_(novel)
Theorems describing elastic materials
energy), i = 0 , 1 , 2 , 3 {\displaystyle i=0,1,2,3} , is the index of the Dirac delta (single force, i = 0 {\displaystyle i=0} ) and n = 1 , 2 , 3 {\displaystyle
Castigliano's_method
Computational quantum mechanical modelling method to investigate electronic structure
principle. An exchange-energy functional was added by Paul Dirac in 1928. However, the Thomas–Fermi–Dirac theory remained rather inaccurate for most applications
Density_functional_theory
Concept in quantum physics
are a solution to the Dirac equation derived by Hermann Weyl, called the Weyl equation. For example, one-half of a charged Dirac fermion of a definite
Weyl_semimetal
Relativistic wave equation describing massless fermions
Mathematically, any Dirac fermion can be decomposed as two Weyl fermions of opposite chirality coupled by the mass term. The Dirac equation was published
Weyl_equation
Conceptual opposite of an electron
which is the antiparticle of the electron. (See also Dirac sea.) In crystals, electronic band structure calculations show that electrons have a negative effective
Electron_hole
View of quantum mechanics
interaction picture (also known as the interaction representation or Dirac picture after Paul Dirac, who introduced it) is an intermediate representation between
Interaction_picture
Model of electrons within a metallic solid
Sommerfeld, who combined the classical Drude model with quantum mechanical Fermi–Dirac statistics and hence it is also known as the Drude–Sommerfeld model. Given
Free_electron_model
Manifold with Riemannian, complex and symplectic structure
manifold with three mutually compatible structures: a complex structure, a Riemannian structure, and a symplectic structure. The concept was first studied by
Kähler_manifold
Structure of the atomic nucleus
of equations of motion. The real particles (here the nucleons) obey the Dirac equation, whilst the virtual ones (here the mesons) obey the Klein–Gordon
Nuclear_structure
Atoms with a single valence electron, so they behave like hydrogen
hydrogen-like ions. The non-relativistic Schrödinger equation and relativistic Dirac equation for the hydrogen atom and hydrogen-like atoms can be solved analytically
Hydrogen-like_atom
Property of particles related to spin
called parity transformation. Invariance under parity transformation by a Dirac fermion is called chiral symmetry. The helicity of a particle is positive
Chirality_(physics)
Theory of forces and subatomic particles
existence of dark matter and neutrino oscillations. In 1928, Paul Dirac introduced the Dirac equation, which implied the existence of antimatter. In 1954,
Standard_Model
Quantum mechanics principle
superconductivity, and the W and Z bosons. Fermions take their name from the Fermi–Dirac statistical distribution, which they obey, and bosons take theirs from the
Pauli_exclusion_principle
Italian-American physicist (1901–1954)
to an ideal gas, employing a statistical formulation now known as Fermi–Dirac statistics. Today, particles that obey the exclusion principle are called
Enrico_Fermi
American theoretical physicist (born 1940)
awarded the 1998 J. J. Sakurai Prize, the 2018 Oskar Klein Medal, and the Dirac Medal of the International Centre for Theoretical Physics in 2023. Leonard
Leonard_Susskind
numbers. Then physicists discovered that these atoms had an internal structure of their own and therefore could be divided after all. Atomic theory is
History_of_atomic_theory
Number of available physical states per energy unit
density of states can give rise to physical properties. Fermi–Dirac statistics: The Fermi–Dirac probability distribution function, Fig. 4, is used to find
Density_of_states
Hypothetical conflict with the laws of physics as currently known
experimental verification. Paul Dirac in 1937 speculated that physical constants such as the gravitational constant or the fine-structure constant might be subject
Time-variation of fundamental constants
Time-variation_of_fundamental_constants
Tensor related to gradients
that the structure tensor S w ( p ) {\displaystyle S_{w}(p)} cannot be factored in this way in general except if w {\displaystyle w} is a Dirac delta function
Structure_tensor
Quantum number parameterizing spin and angular momentum
Frisch and Immanuel Estermann. In 1928, Paul Dirac developed a relativistic wave equation, now termed the Dirac equation, which predicted the spin magnetic
Spin_quantum_number
Symplectic Dirac Operators, Springer-Verlag, ISBN 978-3-540-33420-0 page 35 M. Forger, H. Hess (1979). "Universal metaplectic structures and geometric
Metaplectic_structure
Belgium academic gatherings since 1911
theory were at this Solvay Conference, including Bohr, Born, de Broglie, Dirac, Heisenberg, Pauli, Planck, Lorentz, Compton, Ehrenfest, and Schrödinger
Solvay_Conference
DIRAC STRUCTURE
DIRAC STRUCTURE
Boy/Male
Muslim
Scholar
Girl/Female
Hindu, Indian, Telugu
The Structure of God
Girl/Female
Tamil
Shape, Structure
Boy/Male
Indian
Good Structure
Girl/Female
Indian
Shape, Structure
Girl/Female
Indian
Shape, Structure
Boy/Male
Muslim
Old Arabic name
Boy/Male
Indian
Old Arabic name
Girl/Female
Indian, Kashmiri
Body Structure
Girl/Female
Tamil
Shape, Structure
Girl/Female
Tamil
Beautiful, Splendor, Derived from Indira - Goddess laxmis name
Boy/Male
Indian
Solid structure
Boy/Male
Indian
Scholar
Girl/Female
Indian
Beautiful, Splendor, Derived from Indira - Goddess laxmis name
Boy/Male
Muslim
Solid structure
Girl/Female
Indian
Structure
Boy/Male
Afghan, Arabic, Gujarati, Indian, Muslim
Solid Structure; Lifetime
DIRAC STRUCTURE
DIRAC STRUCTURE
Boy/Male
Arabic, Muslim
All; Breeze of the Truth (Allah)
Boy/Male
Hindu
Devoted to Rama, Lord Hanuman
Surname or Lastname
English (Devon)
English (Devon) : habitational name from Higher Kingdon in Alverdiscott, Devon, or from Kendon in North Bovey, Devon. Both are named in Old English as ‘the king’s hill’, from cyning (see King) or cyne- ‘royal’ + dūn ‘hill’.
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Sindhi, Telugu
Sweet as Grapes
Girl/Female
Hindu
Ashoka third wife
Girl/Female
Tamil
Beloved
Boy/Male
Tamil
Cloud
Surname or Lastname
English (eastern counties)
English (eastern counties) : unexplained. Possibly a variant of Masset (see Massett).
Girl/Female
Biblical
Who governs.
Girl/Female
Australian, Bengali, Danish, Dutch, Finnish, French, German, Hebrew, Indian, Italian, Japanese, Spanish, Swiss, Teutonic
God's Promise; Laughter; Salvation of God; The Lord Helps Me; Variant of Elizabeth; Pledged to God; A Lord; Strong-willed
DIRAC STRUCTURE
DIRAC STRUCTURE
DIRAC STRUCTURE
DIRAC STRUCTURE
DIRAC STRUCTURE
n.
Arrangement of parts, of organs, or of constituent particles, in a substance or body; as, the structure of a rock or a mineral; the structure of a sentence.
n.
A structure of considerable magnitude, usually with arches or supported on trestles, for carrying a road, as a railroad, high above the ground or water; a bridge; especially, one for crossing a valley or a gorge. Cf. Trestlework.
n.
A group of minerals having, a micaceous structure. They are hydrous silicates, derived generally from the alteration of some kind of mica. So called because the scales, when heated, open out into wormlike forms.
n.
A small branching shrub (Dirca palustris), with a white, soft wood, and a tough, leathery bark, common in damp woods in the Northern United States; -- called also moosewood, and wicopy.
a.
Being without symmetry of chemical structure or relation; as, an unsymmetrical carbon atom.
n.
Any one of the abdominal appendages of a crustacean, especially one of the posterior ones, which are often larger than the rest, and different in structure, and are used chiefly in locomotion. See Illust. of Crustacea, and Stomapoda.
a.
Having a definite organic structure; showing differentiation of parts.
n.
A work or structure of stone, brick, or other materials, raised to some height, and intended for defense or security, solid and permanent inclosing fence, as around a field, a park, a town, etc., also, one of the upright inclosing parts of a building or a room.
n.
A structure, usually inclosed with glass, for rearing and protecting vines; a grapery.
a.
Containing, or composed of, vesicles or vesiclelike structures; covered with vesicles or bladders; vesiculate; as, vesicular coral; vesicular lava; a vesicular leaf.
n.
The power possessed by living organisms, both animal and vegetable, of adapting themselves to modifications or changes in their environment, thus possibly giving rise to ultimate variation of structure or function.
a.
Without a definite structure, or arrangement of parts; without organization; devoid of cells; homogeneous; as, a structureless membrane.
n.
An arched structure of masonry, forming a ceiling or canopy.
n.
A general name for any hollow structure made to float upon the water for purposes of navigation; especially, one that is larger than a common rowboat; as, a war vessel; a passenger vessel.
a.
Consisting of, or containing, vessels as an essential part of a structure; full of vessels; specifically (Bot.), pertaining to, or containing, special ducts, or tubes, for the circulation of sap.
a.
Having the form or structure of a vesicle; as, a vesicular body.
n.
A microscopic cell in the structure of an egg, animal, or plant.
n.
In inorganic nature, one of those forms in which a species may occur, which differ in minor characteristics of structure, color, purity of composition, etc.
a.
Destitute of a bony structure.
n.
Manner of organization; the arrangement of the different tissues or parts of animal and vegetable organisms; as, organic structure, or the structure of animals and plants; cellular structure.