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- English Word Tethys Definition A genus of a large naked mollusks having a very large, broad, fringed cephalic disk, and branched dorsal gills. Some of the species become a foot long and are brilliantly colored.
- English Word Tetra- Definition A combining form or prefix signifying four, as in tetrabasic, tetrapetalous.
- English Word Tetra- Definition A combining form (also used adjectively) denoting four proportional or combining parts of the substance or ingredient denoted by the term to which it is prefixed, as in tetra-chloride, tetroxide.
- English Word Tetrabasic Definition 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.
- English Word Tetraboric Definition Same as Pyroboric.
- English Word Tetrabranchiata Definition 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.
- English Word Tetrabranchiate Definition Of or pertaining to the Tetrabranchiata.
- English Word Tetrabranchiate Definition One of the Tetrabranchiata.
- English Word Tetracarpel Definition Composed of four carpels.
- English Word Tetrachord Definition 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.
- English Word Tetrachotomous Definition Having a division by fours; separated into four parts or series, or into series of fours.
- English Word Tetracid Definition 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, C4H6(OH)4, is a tetracid alcohol.
- English Word Tetracoccous Definition Having four cocci, or carpels.
- English Word Tetracolon Definition A stanza or division in lyric poetry, consisting of four verses or lines.
- English Word Tetracoralla Definition Same as Rugosa.
- English Word Tetractinellid Definition Any species of sponge of the division Tetractinellida. Also used adjectively.
- English Word Tetractinellida Definition A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.
- English Word Tetrad Definition The number four; a collection of four things; a quaternion.
- English Word Tetrad Definition A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.
- English Word Tetradactyl Definition Alt. of Tetradactyle