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heptachord

[hep-tuh-kawrd]
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noun
  1. a musical scale of seven notes.
  2. an interval of a seventh.
  3. an ancient Greek stringed instrument.

Origin of heptachord

From the Greek word heptáchordos, dating back to 1720–30. See hepta-, chord1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018