Octachord, ok′ta-kord, n. a musical instrument with eight strings: a diatonic series of eight tones.
Octagon, ok′ta-gon, n. a plane figure of eight sides and eight angles.—adj. Octag′onal. [Gr. oktō, eight, gōnia, an angle.]
Octahedron, ok-ta-hē′dron, n. a solid bounded by eight faces.—adj. Octahē′dral. [Gr. oktō, eight, hedra, a base.]
Octandrous, ok-tan′drus, adj. (bot.) having eight stamens.—n.pl. Octan′dria.—adj. Octan′drian. [Gr. oktō, eight, anēr, andros, a man.]
Octangular, ok-tang′gū-lar, adj. having eight angles.
Octant, ok′tant, n. the eighth part of a circle: an instrument for measuring angles: the aspect of two planets when 45°, or one-eighth of a circle, apart.—Also Oc′tile. [L. octans, octantis—octo, eight.]
Octapla, ok′ta-pla, n. something eightfold: a Bible in eight languages. [Gr. oktaplous, eightfold.]
Octapody, ok-tap′ō-di, n. (pros.) a metre or verse of eight feet.—adj. Octapod′ic.—n. Oc′tastich, a strophe of eight verses or lines—also Octas′tichon.—adj. Octastroph′ic, consisting of eight strophes.
Octastyle. See Octostyle.
Octave, ok′tāv, adj. eight: consisting of eight.—n. an eighth: that which consists of eight: the eighth day after a church festival, counting the feast-day itself as the first: the period between a festival and its octave: (mus.) an eighth, or an interval of twelve semitones: the eighth part of a pipe of wine. [Fr.,—L. octavus, eighth—octo, eight.]