HEPTACHORDS

Noun

heptachords

plural of heptachord

Source: Wiktionary

HEPTACHORD

Hep"ta*chord, n. Etym: [Gr. "epta`xordos seven-stringed; "epta` seven + xordh` chord: cf. F. heptacorde. See Seven, and Chord.]

1. (Anc. Mus.) (a) A system of seven sounds. (b) A lyre with seven chords.

2. (Anc. Poet.)

Definition: A composition sung to the sound of seven chords or tones. Moore (Encyc. of Music).

Source: Webster’s Unabridged Dictionary 1913 Edition