D defs.my
Entry 2 senses Webster, 1913

Heptachord

· Hep·ta·chord · IPA
01 n. A system of seven sounds.
  1. 1.
    A system of seven sounds.(Anc. Mus.)
  2. 2.
    A composition sung to the sound of seven chords or tones.(Anc. Poet.)