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octachord

noun
oc·​ta·​chord | \ ˈäktəˌkȯrd\

Definition of octachord

1 : a musical instrument having eight strings
2 : a system of eight tones (as the diatonic octave)

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History and Etymology for octachord

Latin octachordos with eight strings, from Greek oktachordos, from okta- octa- + -chordos stringed

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