heptachordheptachord means A system of seven sounds. Lexicurio rates it Sui generis — a strength score of 87 out of 100.EtymologyFrom Ancient Greek ἑπτάχορδος (heptákhordos, “seven-stringed”), from ἑπτά (heptá, “seven”) + χορδή (khordḗ, “chord”). Compare French heptacorde.nounA system of seven sounds.A lyre with seven chords.A composition sung to the sound of seven chords or tones.