Webster's Dictionary, 1913

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Tetrabasic adjective [ Tetra- + basic .] (Chemistry) Capable of neutralizing four molecules of a monacid base; having four hydrogen atoms capable of replacement by bases; quadribasic; -- said of certain acids; thus, normal silicic acid, Si(OH) 4 , is a tetrabasic acid.

Tetraboric adjective [ Tetra- + boric .] (Chemistry) Same as Pyroboric .

Tetrabranchiata noun plural [ New Latin See Tetra- , and Branchia .] (Zoology) An order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc.

Tetrabranchiate adjective [ Tetra + branchiate .] (Zoology) Of or pertaining to the Tetrabranchiata. -- noun One of the Tetrabranchiata.

Tetracarpel adjective [ Tetra- + carpellary .] (Botany) Composed of four carpels.

Tetrachord noun [ Latin tetrachordon , Greek ..., from ... four-stringed; te`tra- (see Tetra- ) + ... a chord: confer French tétrachorde .] (Anc. Mus.) A scale series of four sounds, of which the extremes, or first and last, constituted a fourth. These extremes were immutable; the two middle sounds were changeable.

Tetrachotomous adjective [ Greek te`tracha in four parts + te`mnein to cut.] (Botany) Having a division by fours; separated into four parts or series, or into series of fours.

Tetracid adjective [ Tetra + acid .] (Chemistry) Capable of neutralizing four molecules of a monobasic acid; having four hydrogen atoms capable of replacement ba acids or acid atoms; -- said of certain bases; thus, erythrine, C 4 H 6 (OH) 4 , is a tetracid alcohol.

Tetracoccous adjective [ See Tetra- , and Coccus .] (Botany) Having four cocci, or carpels.

Tetracolon noun [ Greek ... with four members; te`tra- (see Tetra- ) + ... limb, member.] (Pros.) A stanza or division in lyric poetry, consisting of four verses or lines. Crabb.

Tetracoralla noun plural [ New Latin See Tetra- , and Corallum .] (Paleon.) Same as Rugosa .

Tetractinellid noun (Zoology) Any species of sponge of the division Tetractinellida. Also used adjectively.

Tetractinellida noun plural [ New Latin , from Greek te`tra- tetra- + ..., ..., ray, spoke.] (Zoology) A division of Spongiæ in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinæ .

Tetrad 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 adjective [ Confer French tétradactyle .] (Zoology) Tetradactylous.

Tetradactylous adjective [ Greek ...; te`tra- (see Tetra- ) + ... finger, toe.] (Zoology) Having, or characterized by, four digits to the foot or hand.

Tetradecane 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 noun plural [ New Latin See Tetra- , and Decapoda .] (Zoology) Same as Arthrostraca .

Tetradic adjective (Chemistry) Of or pertaining to a tetrad; possessing or having the characteristics of a tetrad; as, a carbon is a tetradic element.

Tetradite 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 noun (Zoology) See Tetrodon .

Tetradont adjective & noun (Zoology) See Tetrodont .

Tetradrachm 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 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 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 noun (Botany) A plant of the order Tetradynamia.

Tetradynamian, Tetradynamous adjective (Botany) Belonging to the order Tetradynamia; having six stamens, four of which are uniformly longer than the others.

Tetragon 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 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 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 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 adjective (Botany) Belonging to the order Tetragynia; having four styles.

Tetrahedral 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 adverb In a tetrahedral manner.

Tetrahedrite 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 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 adjective (Crystallog.) Pertaining to a tetrahexahedron.

Tetrahexahedron 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 noun [ Greek ... four times + English hexahedron .] (Crystallog.) A tetrahexahedron.

Tetrakosane 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 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 noun plural [ New Latin See Tetramerous .] (Zoology) A division of Coleoptera having, apparently, only four tarsal joints, one joint being rudimentary.

Tetramerous 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 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 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 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 noun plural [ New Latin , from Greek te`tra- (see Tetra- ) + ..., ..., a man, male.] (Botany) A Linnæan class of plants having four stamens.

Tetrandrian, Tetrandrous adjective (Botany) Belonging to the class Tetrandria.

Tetraonid 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 adjective [ Tetra- + petal .] (Botany) Containing four distinct petals, or flower leaves; as, a tetrapetalous corolla.