{ O"chre*ate (?), O"chre*a`ted (?), } a. 1. Wearing or furnished with
an ochrea or legging; wearing boots; booted.
A scholar undertook . . . to address himself ochreated unto the
vice chancellor.
Fuller.
2. (Bot.) Provided with ochrea, or sheathformed stipules, as the
rhubarb, yellow dock, and knotgrass.
O"chre*ous (?), a. See Ocherous.
O"chrey (?), a. See Ochery.
Och`ro*leu"cous (?), a. [Gr. &?; ocher + &?; white.] Yellowish white;
having a faint tint of dingy yellow. Gray.
O"chry (?), a. See Ochery.
Och"y*my (?), n. [Obs.] See Occamy.
-ock (?). [AS. -uc.] A suffix used to form diminutives; as, bullock,
hillock.
O"cra (?), n. (Bot.) See Okra.
||O"cre*a (?), n. [L.] See Ochrea.
{ O"cre*ate (?), O"cre*a"ted (?), } a. [See Ochrea.] Same as Ochreate,
Ochreated.
Oc"ta- (?). A prefix meaning eight. See Octo-.
Oc"ta*chord (?), n. [Gr. &?; with eight strings; &?; (for &?; eight) +
&?; string, chord: cf.F. octacorde.] (Mus.) An instrument of eight
strings; a system of eight tones. [Also written octochord.]
Oc"tad (?), n. [Gr. &?;, &?;, the number eight.] (Chem.) An atom or
radical which has a valence of eight, or is octavalent.
Oc`ta*e"dral (?), a. See Octahedral.
||Oc`ta*em"e*ron (?), n. [NL., fr. Gr. &?;, neut. of &?; of the eighth
||day.] (Eccl.) A fast of eight days before a great festival. Shipley.
Oc"ta*gon (?), n. [Gr. &?; eight- cornered; &?; (for &?; eight) + &?;
an angle: cf.F. cctogone.] 1. (Geom.) A plane figure of eight sides and
eight angles.
2. Any structure (as a fortification) or place with eight sides or
angles.
Regular octagon, 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.
Poe.
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 (generally called a quadrant),
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.
Oc`ta*roon" (?), n. See Octoroon.
Oc"ta*style (?), a. See Octostyle.
Oc"ta*teuch (?), n. [L. octateuchus, Gr. &?;.] A collection of eight
books; especially, the first eight books of the Old Testament. [R.]
Oc*tav"a*lent (?), a. [Octa- + L. valens, p. pr. See Valence.] (Chem.)
Having a valence of eight; capable of being combined with, exchanged
for, or compared with, eight atoms of hydrogen; -- said of certain
atoms or radicals.
Oc"tave (?), n. [F., fr. L. octava an eighth, fr. octavus eighth, fr.
octo eight. See Eight, and cf. Octavo, Utas.] 1. The eighth day after a
church festival, the festival day being included; also, the week
following a church festival. "The octaves of Easter." Jer. Taylor.
2. (Mus.) (a) The eighth tone in the scale; the interval between one
and eight of the scale, or any interval of equal length; an interval of
five tones and two semitones. (b) The whole diatonic scale itself.
The ratio of a musical tone to its octave above is 1:2 as regards the
number of vibrations producing the tones.
3. (Poet.) The first two stanzas of a sonnet, consisting of four verses
each; a stanza of eight lines.
With mournful melody it continued this octave.
Sir P. Sidney.
Double octave. (Mus.) See under Double. -- Octave flute (Mus.), a small
flute, the tones of which range an octave higher than those of the
German or ordinary flute; -- called also piccolo. See Piccolo.