Heptachord \Hep"ta*chord\, 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]