Emily Dickinson Lexicon
Definition for TET'RA-CHORD
TET'RA-CHORD, n. [Gr. τετταρα, four, and χορδη, a chord.]
In ancient music, a diatessaron; a series of four sounds, of which the extremes, or first and last, constituted a fourth. These extremes were immutable; the two middle sounds were changeable. Cyc.
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