Icositetrahedron :: Icositetrahedron (n.) A twenty-four-sided solid; a tetragonal trisoctahedron or trapezohedron.

Obstetric :: Obstetric (a.) Alt. of Obstetrica.

Obstetrical :: Obstetrical (a.) Of or pertaining to midwifery, or the delivery of women in childbed; as, the obstetric art..

Obstetricate :: Obstetricate (v. i.) To perform the office of midwife.

Obstetricate :: Obstetricate (v. t.) To assist as a midwife.

Obstetrication :: Obstetrication (n.) The act of assisting as a midwife; delivery.

Obstetrician :: Obstetrician (n.) One skilled in obstetrics; an accoucheur.

Obstetricious :: Obstetricious (a.) Serving to assist childbirth; obstetric; hence, facilitating any bringing forth or deliverance..

Obstetrics :: Obstetrics (n.) The science of midwifery; the art of assisting women in parturition, or in the trouble incident to childbirth..

Obstetricy :: Obstetricy (n.) Obstetrics.

Platetrope :: Platetrope (n.) One of a pair of a paired organs.

Pseudotetramera :: Pseudotetramera (n. pl.) A division of beetles having the fifth tarsal joint minute and obscure, so that there appear to be but four joints..

Tetra- :: Tetra- () A combining form or prefix signifying four, as in tetrabasic, tetrapetalous..

Tetra- :: Tetra- () 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..

Tetrabasic :: Tetrabasic (a.) 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 :: Tetraboric (a.) Same as Pyroboric.

Tetrabranchiata :: Tetrabranchiata (n. pl.) 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 :: Tetrabranchiate (a.) Of or pertaining to the Tetrabranchiata.

Tetrabranchiate :: Tetrabranchiate (n.) One of the Tetrabranchiata.

Tetracarpel :: Tetracarpel (a.) Composed of four carpels.

Tetrachord :: Tetrachord (n.) 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 :: Tetrachotomous (a.) Having a division by fours; separated into four parts or series, or into series of fours..

Tetracid :: Tetracid (a.) 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..

Tetracoccous :: Tetracoccous (a.) Having four cocci, or carpels..

Tetracolon :: Tetracolon (n.) A stanza or division in lyric poetry, consisting of four verses or lines..

Tetracoralla :: Tetracoralla (n. pl.) Same as Rugosa.

Tetractinellid :: Tetractinellid (n.) Any species of sponge of the division Tetractinellida. Also used adjectively.

Tetractinellida :: Tetractinellida (n. pl.) A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.

Tetrad :: Tetrad (n.) The number four; a collection of four things; a quaternion.

Tetrad :: Tetrad (n.) A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad..

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