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.

4. A small cask of wine, the eighth part of a pipe.

(Oc"tave) a. Consisting of eight; eight. Dryden.

(Oc*ta"vo) n.;pl. Octavos [L. in octavo; in in + octavo, abl. of octavus. See Octave.] A book composed of sheets each of which is folded into eight leaves; hence, indicating more or less definitely a size of book so made; — usually written 8vo or 8°.

(Oc*ta"vo), a. Having eight leaves to a sheet; as, an octavo form, book, leaf, size, etc.

(Oc"tene) n. [See Octo-.] (Chem.) Same as Octylene.

(Oc*ten"ni*al) a. [L. octennium a period of eight years; octo eight + annus year.] Happening every eighth year; also, lasting a period of eight years. Johnson.Oc*ten"ni*al*ly, adv.

(Oc*tet") n. [From L. octo eight, like E. duet, fr.L. duo. See Octave.] (Mus.) A composition for eight parts, usually for eight solo instruments or voices.

(Oc"tic) a. [Octo- + - ic.] (Math.) Of the eighth degree or order.n. (Alg.) A quantic of the eighth degree.

(Oc"tile) n. [Cf. F. octil, a. See Octant.] Same as Octant, 2. [R.]

(Oc*til"lion) n. [L. octo eight + -illion, as in E. million: cf. F. octillion.] According to the French method of numeration (which method is followed also in the United States) the number expressed by a unit with twenty-seven ciphers annexed. According to the English method, the number expressed by a unit with forty-eight ciphers annexed. See Numeration.

(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.

  By PanEris using Melati.

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