The Collaborative International Dictionary
Heptachord
Heptachord \Hep"ta*chord\, n. [Gr. "epta`chordos seven-stringed; "epta` seven + chordh` chord: cf. F. heptacorde. See Seven, and Chord.]
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(Anc. Mus.)
A system of seven sounds.
A lyre with seven chords.
(Anc. Poet.) A composition sung to the sound of seven chords or tones.
--Moore (Encyc. of Music).
Wiktionary
heptachord
n. 1 (context music English) A system of seven sounds. 2 (context music English) A lyre with seven chords. 3 (context poetry English) A composition sung to the sound of seven chords or tones.