tetragon

Definitions

  • WordNet 3.6
    • n tetragon a four-sided polygon
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Webster's Revised Unabridged Dictionary
    • Tetragon (Geom) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.
    • Tetragon (Astrol) An aspect of two planets with regard to the earth when they are distant from each other ninety degrees, or the fourth of a circle.
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Century Dictionary and Cyclopedia
    • n tetragon In geometry, a figure having four angles; a quadrangle; a quadrilateral.
    • n tetragon In astrology, an aspect of two planets with regard to the earth when they are distant from each other 90°, or the fourth part of a circle; quartile aspect; square.
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Chambers's Twentieth Century Dictionary
    • n Tetragon tet′ra-gon a figure of four angles
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Etymology

Webster's Revised Unabridged Dictionary
L. tetragonum, Gr. tetra`gwnon; te`tra-see Tetra-) + gwni`a corner, angle: cf. F. tétragone,
Chambers's Twentieth Century Dictionary
Gr. tetragonontetra-, four gōnia, an angle.

Usage

In literature:

If you can be satisfied with my dinner-it consists of cooked tetragones and fruits.
"The Three Musketeers" by Alexandre Dumas, Pere
A figure that is bounded by four straight lines is termed a quadrangle, quadrilateral or tetragon.
"Mechanical Drawing Self-Taught" by Joshua Rose
It was long, built around two sections of the tetragon, and with low divans beneath the view windows.
"Operation Haystack" by Frank Patrick Herbert
The density and specific heat of the tetragonal form are greater than those of the yellow.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1" by Various
It consists of tin dioxide, or stannic oxide (SnO2), and crystallizes in the tetragonal system.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various
Tetragonal prism of the second order.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7" by Various
Leaves sessile, keeled on both sides (tetragonal).
"The Manual of the Botany of the Northern United States" by Asa Gray
Peligot obtained it as minute tetragonal octahedra and cubes by reducing ferrous chloride in hydrogen.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 7" by Various
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In news:

The formation of martensite involves the structural rearrangement (by shear displacement) of the atoms from face-centered cubic (FCC) austenite into a body-centered tetragonal (BCT) martensitic structure.
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In science:

We obtain the series for the randomly dilute cubic model for w = 0 and N = 0 and those of the tetragonal model for w = 0 and M = 2.
Spin models with random anisotropy and reflection symmetry
Orbital overlap between cations and anions determines whether the balls are ordered or disordered, i.e. the crystal is tetragonal or orthorhombic,6,23,24 but the molecular symmetry is the same D2h in both cases.
Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts A4C60 (A = K, Rb, Cs)
The consequence is that the threefold degenerate orbitals will show a threefold splitting in both an orthorhombic and tetragonal environment.
Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts A4C60 (A = K, Rb, Cs)
For the overall symmetry to become tetragonal, we have to assume there exists an average (spatial or temporal) of several molecules.
Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts A4C60 (A = K, Rb, Cs)
This scenario is, however, not the only possible geometry whose spatial average results in a tetragonal crystal.
Static and dynamic Jahn-Teller effect in the alkali metal fulleride salts A4C60 (A = K, Rb, Cs)
The crystallographic axes are shown; in (a) we take ˜a = a + b, ˜b = a − b where a and b are the axes in the tetragonal cell.
Theoretical Aspects of Charge Ordering in Molecular Conductors
We performed full optimization of the lattice parameters and internal coordinates of CsBiNb2O7 in the tetragonal reference structure space group P4/mmm.
Ferroelectricity in the Dion-Jacobson CsBiNb$_2$O$_7$ from first principles
This orthorhombicity is determined by the x-ray diffraction data presented in Fig. 4(b): the two data sets were recorded independently for a and b axes and would be identical to one another if the crystals were tetragonal.
Tl2Ba2CuO6+d Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-Tc Cuprates
This is a direct consequence of the symmetry of the body-centered tetragonal unit cell, and holds also for LSCO.
Tl2Ba2CuO6+d Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-Tc Cuprates
Schematic view of the CE-type structure in the basal plane of the tetragonal structure.
The nanoscale phase separation in hole-doped manganites
Onset of bad metallic behavior correlates with a structural (tetragonal-orthorhombic (T-O)) distortion at T ∗ ≃ 150 K, below which SDW order sets in.
Normal State Correlated Electronic Structure of Iron Pnictides
The crystallographic data for tetragonal phase of two compounds is collected in Table 1.
Electronic Structure of Prototype AFe_2As_2 and ReOFeAs High-Temperature Superconductors: a Comparison
P-low-T collapsed-tetragonal [Ref. 18] suggests that these could be one and the same.
Hydrostatic pressure study of the structural phase transitions and superconductivity in single crystals of (Ba1-xKx)Fe2As2 (x = 0 and 0.45) and CaFe2As2
For an accurate groundstate, convergence requires a kinetic-energy cutoff of 20 Ha and a tetragonal supercell with lengths a = b = 25 aB and c = 40 aB .
Ab initio investigation of the groundstate, electronic, and optical properties of polyyne and cumulene prototypes
The gain of energy with respect to the paraelectric reference (∆E), the polarization (P) and the tetragonality c/a are reported in Table I.
Strain-induced ferroelectricity in simple rocksalt binary oxides
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