| Heptachord 1. (n.) A system of seven sounds. 2. (n.) A lyre with seven chords. 3. (n.) A composition sung to the sound of seven chords or tones. Thesaurus Entries French harp, Irish harp, aeolian harp, cithara, clarsach, dulcimer, harmonica, harmonicon, heptachord, hexachord, kazoo, langspiel, lyre, mouth bow, mouth harp, mouth organ, polychord, symphonia, zither | ![]() |