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American Dictionary of the English Language

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Heptachord


HEP'TACHORD, noun [Gr. seven, and chord.] A system of seven sounds. In ancient poetry, verses sung or played on seven chords or different notes. In this sense the word was applied to the lyre, when it had but seven strings. One of the intervals is also called a heptachord as containing the same number of degrees between the extremes.