Dictionary: OC'TA-CHORD – OCTO-GE-NA-RY

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OC'TA-CHORD, n.

An instrument or system of eight sounds. Busby.

OC'-TA-GON, n. [Gr. {foreign}, eight, and {foreign}, angle.]

  1. In geometry, a figure of eight sides and eight angles. When the sides and angles are equal, it is a regular octagon which may be inscribed in a circle. Harris. Encyc.
  2. In fortification, a place with eight bastions. Encyc.

OC-TAG'ON-AL, a.

Having eight sides and eight angles.

OC-TA-HE'DRAL, a. [See Octahedron.]

Having eight equal sides.

OC-TA-HE'DRITE, n.

Pyramidical ore of titanium. Ure.

OC-TA-HE'DRON, n. [Gr. {foreign}, eight, and {foreign}, a base.]

In geometry, a solid contained by eight equal and equilateral triangles. It is one of the five regular bodies. Encyc. OC-TAN'DER, n. [Gr. {foreign}, eight, and {foreign}, a male.] In botany, a monoclinous or hermaphrodite plant, having eight stamens, which are distinct from each other, and distinct from the pistil.

OC-TAN'DRI-AN, a.

Having the characters of an octander.

OC-TAN'GU-LAR, a. [L. octo, eight, and angular.]

Having eight angles.

OC-TAN'GU-LAR-NESS, n.

The quality of having eight angles.

OC'TANT, n. [L. octans, an eighth part, from octo, eight.]

In astronomy, that aspect of two planets in which they are distant from each other the eighth part of a circle or 45 ĚŠ. Encyc.

OC'TA-STYLE, n. [Gr. {foreign} and {foreign}.]

In architecture, an edifice having eight columns in front.

OC'TA-TEUCH, n.

The first eight books of the Old Testament. Hanmer. [This is an improper word; there being no alliance in the first eight books, more than in the first ten or fifteen books.]

OC'TAVE, a. [infra.]

Denoting eight. Dryden.

OC'TAVE, n. [Fr. from L. octavus, eighth.]

  1. The eighth day after a festival. Johnson.
  2. Eight days together after a festival. Ainsworth.
  3. In music, an eighth, or an interval of seven degrees or twelve semitones. The octave is the most perfect of the chords, consisting of six full tones and two semitones major. It contains the whole diatonic scale. Encyc.

OC-TA'V'O, n. [L. octavus, eighth.]

A book in which a sheet is folded into eight leaves. The word is used as a noun or an adjective. We say, an octavo, or an octavo volume. The true phrase is, a book in octavo.

OC-TEN'NI-AL, a. [L. octo, eight, and annus, year.]

  1. Happening every eighth year.
  2. Lasting eight years.

OC-TEN'NI-AL-LY, adv.

Once in eight years.

OC'TILE, n.

The same as octant, supra.

OC-TIL'LION, n.

The. number produced by involving a million to the eighth power.

OC-TO'BER, n. [L. from octo, eight; the eighth month of the primitive Roman year which began in March.]

The tenth month of the year in our calendar, which follows that of Numa and Julius Caesar.

OC-TO'BER, n.

A kind of ale, jocosely so called.

OC-TO-DEC'I-MAL, a. [L. octo, eight, and decem; ten.]

In crystalography, designating a crystal whose prisms, or the middle part, has eight faces, and the two summits together ten faces.

OC-TO-DEN'TATE, a. [L. octo, eight, and dentatus, toothed.]

Having eight teeth.

OC'TO-FID, a. [L. octo, eight, and findo, to cleave.]

In botany, cleft or separated into eight segments; as a calyx. Martyn. n.

OCTO-GE-NA-RY, a. [L. octogenarius, from octogeni eighty.]

Of eighty years of age.