n. [ Gr. "epta`chordos seven-stringed; "epta` seven + chordh` chord: cf. F. heptacorde. See Seven, and Chord. ] 1. (Anc. Mus.) (a) A system of seven sounds. (b) A lyre with seven chords. [ 1913 Webster ]
2. (Anc. Poet.) A composition sung to the sound of seven chords or tones. Moore (Encyc. of Music). [ 1913 Webster ]
n. [ L. heptas the number seven. Gr. &unr_;, &unr_;, fr. "epta` seven.] (Chem.) An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective. [1913 Webster]
n. [ Gr. &unr_; sevencornered; "epta` seven + &unr_; angle: cf. F. heptagone.] (Geom.) A plane figure consisting of seven sides and having seven angles. [1913 Webster]
a. [ Cf. F. heptagonal. ] Having seven angles or sides. [ 1913 Webster ]
Heptagonal numbers (Arith.), the numbers of the series 1, 7, 18, 34, 55, etc., being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc. [ 1913 Webster ]
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