, one in which the sides are all equal, and the angles also are all equal.

(Oc*tag"o*nal) a. Having eight sides and eight angles.

(Oc*tag"y*nous) a. [Octa- + Gr. wife.] (Bot.) Having eight pistils or styles; octogynous.

(Oc`ta*he"dral) a. [See Octahedron.] Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage.

Octahedral borax(Chem.), borax obtained from a saturated solution in octahedral crystals, which contain five molecules of water of crystallization; distinguished from common or prismatic borax. Octahedral iron ore(Min.), magnetite.

(Oc`ta*he"drite) n. (Min.) Titanium dioxide occurring in acute octahedral crystals.

(Oc`ta*he"dron) n. [Gr. fr. eight-side; (for eight) + seat, base, from to sit.] (Geom.) A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.

(Oc*tam"er*ous) a. [Octa- + Gr. part.] (Biol.) Having the parts in eights; as, an octamerous flower; octamerous mesenteries in polyps.

(Oc*tam"e*ter) n. [Cf.L. octameter in eight feet. See Octa-, and meter.] (Pros.) A verse containing eight feet; as, —

Deep'b6 in|to'b6 the | dark'b6ness | peer'b6ing, | long'b6 I | stood'b6 there | wond''b6ring, | fear'b6ing.

(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 stamens.

(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.

Regular octagon

  By PanEris using Melati.

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