Ancient Greek seven-stringed, seven + chord: compare French heptacorde. See seven and chord.
"heptachord." YourDictionary, n.d. Web. 18 December 2018. <https://www.yourdictionary.com/heptachord>.
heptachord. (n.d.). Retrieved December 18th, 2018, from https://www.yourdictionary.com/heptachord
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