heptachord

noun

hep·​ta·​chord

-ˌkȯrd

1

: a 7-stringed lyre of ancient Greece

2

: a diatonic scale of seven notes or tones

3

: the interval of a seventh

Word History

Etymology

Late Latin heptachordus with seven strings, from Greek heptachordos, from hepta- + -chordos stringed

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