(Oc*tan"der) n. One of the Octandria.
(||Oc*tan"dri*a) n. pl. [NL., fr. Gr. (for eight) + male, man.] (Bot.) A Linnæan class of plants,
in which the flowers have eight stamens not united to one another or to the pistil.
(Oc*tan"dri*an Oc*tan"drous) a. (Bot.) Of or pertaining to the Octandria; having eight distinct
(Oc"tane) n. [See Octa-] . (Chem.) Any one of a group of metametric hydrocarcons (C8H18)
of the methane series. The most important is a colorless, volatile, inflammable liquid, found in petroleum,
and a constituent of benzene or ligroin.
(Oc*tan"gu*lar) a. [L. octangulus eight-cornered; octo eight + angulus angle.] Having
eight angles; eight-angled. Oc*tan"gu*lar*ness, n.
(Oc"tant) n. [L. octans, - antis. fr. octo eight. See Octave.]
1. (Geom.) The eighth part of a circle; an arc of 45 degrees.
2. (Astron. & Astrol.) The position or aspect of a heavenly body, as the moon or a planet, when half
way between conjunction, or opposition, and quadrature, or distant from another body 45 degrees.
3. An instrument for measuring angles having an arc which measures up to 9O°, but being itself the
eighth part of a circle. Cf. Sextant.
4. (Math. & Crystallog.) One of the eight parts into which a space is divided by three coördinate planes.
(||Oc"ta*pla) n.; etymol. pl., but syntactically sing. [NL., fr.Gr. (for eight) + -pla, as in E. hexapla; cf.Gr.
eightfold.] A portion of the Old Testament prepared by Origen in the 3d century, containing the Hebrew
text and seven Greek versions of it, arranged in eight parallel columns.