heptachord

Noun

hep=ta=chord

CIDE DICTIONARY

heptachord, n. [Gr. "epta`chordos seven-stringed; "epta` seven + chordh` chord: cf. F. heptacorde. See Seven, and Chord.].

A system of seven sounds. [1913 Webster]
A composition sung to the sound of seven chords or tones. Moore (Encyc. of Music). [1913 Webster]

For further exploring for "heptachord" in Webster Dictionary Online

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