Tetrad Tet"rad noun [ Latin
tetras ,
- adis , Greek ..., ...: confer French
tétrade .]
1. The number four; a collection of four things; a quaternion. 2. (Chemistry) A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad .
Tetradactyl, Tetradactyle Tet`ra·dac"tyl, Tet`ra·dac"tyle adjective [ Confer French
tétradactyle .]
(Zoology) Tetradactylous.
Tetradactylous Tet`ra·dac"tyl·ous adjective [ Greek ...;
te`tra- (see
Tetra- ) + ... finger, toe.]
(Zoology) Having, or characterized by, four digits to the foot or hand.
Tetradecane Tet`ra·dec"ane noun [
Tetra- + Greek ... ten.]
(Chemistry) A light oily hydrocarbon, C 14 H 30 , of the marsh-gas series; -- so called from the fourteen carbon atoms in the molecule.
Tetradecapoda Tet`ra·de·cap"o·da noun plural [ New Latin See
Tetra- , and
Decapoda .]
(Zoology) Same as Arthrostraca .
Tetradic Tet·rad"ic adjective (Chemistry) Of or pertaining to a tetrad; possessing or having the characteristics of a tetrad; as, a carbon is a tetradic element.
Tetradite Tet"ra·dite noun [ See
Tetrad .]
A person in some way remarkable with regard to the number four, as one born on the fourth day of the month, or one who reverenced four persons in the Godhead. Smart.
Tetradon Tet"ra·don noun (Zoology) See Tetrodon .
Tetradont Tet"ra·dont adjective & noun (Zoology) See Tetrodont .
Tetradrachm Tet"ra·drachm Tet`ra*drach"ma noun [ New Latin tetradrachma , from Greek tetra`drachmon ; te`tra- (see Tetra- ) + drachmh` drachm, drachma.] A silver coin among the ancient Greeks, of the value of four drachms. The Attic tetradrachm was equal to 3s. 3d. sterling, or about 76 cents.
Tetradymite Tet·rad"y·mite noun [ Greek
tetra`dymos fourfold. So named from its occurrence in compound twin crystals, or fourlings.]
(Min.) A telluride of bismuth. It is of a pale steel-gray color and metallic luster, and usually occurs in foliated masses. Called also telluric bismuth .
Tetradynamia Tet`ra·dy·na"mi·a noun plural [ New Latin , from Greek
te`tra- (see
Tetra- ) + ... power.]
(Botany) A Linnæan class of plants having six stamens, four of which are longer than the others.
Tetradynamian Tet`ra·dy·na"mi·an noun (Botany) A plant of the order Tetradynamia.
Tetradynamian, Tetradynamous Tet`ra·dy·na"mi·an, Tet`ra·dyn"a·mous adjective (Botany) Belonging to the order Tetradynamia; having six stamens, four of which are uniformly longer than the others.
Tetragon Tet"ra·gon noun [ Latin
tetragonum , Greek
tetra`gwnon ;
te`tra- (see
Tetra- ) +
gwni`a corner, angle: confer French
tétragone .]
1. (Geom.) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc. 2. (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. Hutton.
Tetragonal Te·trag"o·nal adjective 1. (Geom.) Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers. 2. (Botany) Having four prominent longitudinal angles. 3. (Crystallog.) Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system , under Crystallization .
Tetragrammaton Tet`ra·gram"ma·ton noun [ New Latin , from Greek ...;
te`tra- (see
Tetra- ) + ... a letter.]
The mystic number four, which was often symbolized to represent the Deity, whose name was expressed by four letters among some ancient nations; as, the Hebrew JeHoVaH , Greek qeo`s , Latin deus , etc.
Tetragynia Tet`ra·gyn"i·a noun plural [ New Latin , from Greek
te`tra- (see
Tetra- ) +
gynh` a woman, female.]
(Botany) A Linnæan order of plants having four styles.
Tetragynian, Tetragynous Tet`ra·gyn"i·an, Te·trag"y·nous adjective (Botany) Belonging to the order Tetragynia; having four styles.
Tetrahedral Tet`ra·he"dral adjective [ See
Tetrahedron .]
1. Having, or composed of, four sides. 2. (Crystallog.) (a) Having the form of the regular tetrahedron. (b) Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs. Tetrahedral angle (Geom.) ,
a solid angle bounded or inclosed by four plane angles.
Tetrahedrally Tet`ra·he"dral·ly adverb In a tetrahedral manner.
Tetrahedrite Tet`ra·he"drite noun [ So called because the crystals of the species are commonly
tetrahedrons .]
(Min.) A sulphide of antimony and copper, with small quantities of other metals. It is a very common ore of copper, and some varieties yield a considerable presentage of silver. Called also gray copper ore , fahlore , and panabase .
Tetrahedron Tet`ra·he"dron noun [
Tetra- + Greek ... seat, base, from ... to sit.]
(Geom.) A solid figure inclosed or bounded by four triangles. » In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron.
Regular tetrahedron (Geom.) ,
a solid bounded by four equal equilateral triangles; one of the five regular solids.
Tetrahexahedral Tet`ra·hex`a·he"dral adjective (Crystallog.) Pertaining to a tetrahexahedron.
Tetrahexahedron Tet`ra·hex`a·he"dron noun [
Tetra- +
hexahedron .]
(Crystallog.) A solid in the isometric system, bounded by twenty-four equal triangular faces, four corresponding to each face of the cube.
Tetrakishexahedron Tet`ra·kis·hex`a·he"dron noun [ Greek ... four times + English
hexahedron .]
(Crystallog.) A tetrahexahedron.
Tetrakosane Tet"ra·ko·sane` noun [
Tetra- + Greek ... twenty.]
(Chemistry) A hydrocarbon, C 24 H 50 , resembling paraffin, and like it belonging to the marsh-gas series; -- so called from having twenty-four atoms of carbon in the molecule.
Tetralogy Te·tral"o·gy noun [ Greek ...;
te`tra- (see
Tetra- ) + ... a speech, discourse: confer French
tétralogie .]
(Gr. Drama) A group or series of four dramatic pieces, three tragedies and one satyric, or comic, piece (or sometimes four tragedies), represented consequently on the Attic stage at the Dionysiac festival. » A group or series of three tragedies, exhibited together without a fourth piese, was called a
trilogy .
Tetramera Te·tram"e·ra noun plural [ New Latin See
Tetramerous .]
(Zoology) A division of Coleoptera having, apparently, only four tarsal joints, one joint being rudimentary.
Tetramerous Te·tram"er·ous adjective [
Tetra- + Greek ... part.]
1. (Botany) Having the parts arranged in sets of four; as, a tetramerous flower. 2. (Zoology) Having four joints in each of the tarsi; -- said of certain insects.
Tetrameter Te·tram"e·ter noun [ Latin
tetrametrus , Greek ...;
te`tra- (see
Tetra- ) + ... a measure: confer French
tétramètre .]
(GR. & Latin Pros.) A verse or line consisting of four measures, that is, in iambic, trochaic, and anapestic verse, of eight feet; in other kinds of verse, of four feet.
Tetramethylene Tet`ra·meth"yl·ene noun [
Tetra- +
methylene .]
(Chemistry) (a) A hypothetical hydrocarbon, C 4 H 8 , analogous to trimethylene, and regarded as the base of well-known series or derivatives. (b) Sometimes, an isomeric radical used to designate certain compounds which are really related to butylene.
Tetramorph Tet"ra·morph noun [
Tetra- + Greek ... form, figure: confer Greek ... fourfold.]
(Christian Art) The union of the four attributes of the Evangelists in one figure, which is represented as winged, and standing on winged fiery wheels, the wings being covered with eyes. The representations of it are evidently suggested by the vision of Ezekiel (ch. i.)
Tetrandria Te·tran"dri·a noun plural [ New Latin , from Greek
te`tra- (see
Tetra- ) + ..., ..., a man, male.]
(Botany) A Linnæan class of plants having four stamens.
Tetrandrian, Tetrandrous Te·tran"dri·an, Te·tran"drous adjective (Botany) Belonging to the class Tetrandria.
Tetraonid Te·tra"o·nid noun [ Latin
tetrao a heath cock, grouse, Greek ...: confer French
tétraonide .]
(Zoology) A bird belonging to the tribe of which the genus Tetrao is the type, as the grouse, partridge, quail, and the like. Used also adjectively.
Tetrapetalous Tet`ra·pet"al·ous adjective [
Tetra- +
petal .]
(Botany) Containing four distinct petals, or flower leaves; as, a tetrapetalous corolla.
Tetrapharmacom, Tetrapharmacum Tet`ra·phar"ma·com, Tet`ra·phar"ma·cum noun [ New Latin
tetrapharmacon , Latin
tetrapharmacum , Greek ...;
te`tra- (see
Tetra- ) + ... a drug.]
(Medicine) A combination of wax, resin, lard, and pitch, composing an ointment. Brande & C.
Tetraphenol Tet`ra·phe"nol noun [
Tetra- +
phenol .]
(Chemistry) Furfuran. [ Obsolete]
Tetraphyllous Te·traph"yl·lous adjective [
Tetra- + Greek ... a leaf.]
(Botany) Having four leaves; consisting of four distinct leaves or leaflets.
Tetrapla Tet"ra·pla noun ; etymologically
plural , but syntactically
sing. [ New Latin , from Greek
tetraplo`os ,
tetraploy^s , fourfold.]
A Bible consisting of four different Greek versions arranged in four columns by Origen; hence, any version in four languages or four columns.
Tetrapneumona Tet`rap·neu"mo·na noun plural [ New Latin See
Tetra- , and
Pneumo- .]
(Zoology) A division of Arachnida including those spiders which have four lungs, or pulmonary sacs. It includes the bird spiders (Mygale) and the trapdoor spiders. See Mygale .
Tetrapnuemonian Tet`rap·nue·mo"ni·an noun (Zoology) One of the Tetrapneumona.
Tetrapod Tet"ra·pod noun [ Greek ... fourfooted;
te`tra- (see
Tetra- ) + ..., ..., foot.]
(Zoology) An insect characterized by having but four perfect legs, as certain of the butterflies.
Tetrapody Te·trap"o·dy noun [ Greek ....]
A set of four feet; a measure or distance of four feet.
Tetrapteran Te·trap"ter·an noun [ See
Tetrapterous .]
(Zoology) An insect having four wings.
Tetrapterous Te·trap"ter·ous adjective [ Greek ...;
te`tra- (see
Tetra- ) + ... wing.]
(Zoology) Having four wings.
Tetraptote Tet"rap·tote noun [ Latin
tetraptotum , Greek ....]
(Gram.) A noun that has four cases only. Andrews.
Tetrarch Te"trarch noun [ Latin
tetrarches , Greek ..., ...;
te`tra- (see
Tetra- ) + ... a ruler, ... to lead; rule: confer French
tétrarque . See
Arch ,
adjective ]
(Rom. Antiq.) A Roman governor of the fourth part of a province; hence, any subordinate or dependent prince; also, a petty king or sovereign.
Tetrarch Te"trarch adjective Four. [ Obsolete]
Fuller.
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