heptachord

n.

[Gr. "epta`chordos seven-stringed; "epta` seven + chordh` 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.) A composition sung to the sound of seven chords or tones. Moore (Encyc. of Music).

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A seven-note SCALE, e.g. the major or minor scale.

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IN BRIEF: A seven stringed lyre of ancient Greece.