Bible Dictionaries
Tetrachord
Webster's Dictionary
(n.) A scale 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.
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Bibliography Information
Webster, Noah. Entry for 'Tetrachord'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/tetrachord.html. 1828.