
• (n.) A composition sung to the sound of seven chords or tones. • (n.) A lyre with seven chords. • (n.) A system of seven sounds.
Found on
http://thinkexist.com/dictionary/meaning/heptachord/

Hep'ta·chord noun [ Greek 'epta`xordos seven-stringed; 'epta` seven + xordh` chord: confer French heptacorde . See Seven , and Chord .] 1. (Anc. Mus.) (a) A system of seven sounds. (b) A lyre with seven chords.
Found on
http://www.encyclo.co.uk/webster/H/34
No exact match found.