Tetrachord Definition

tĕtrə-kôrd
noun
A series of four tones contained in the interval of a perfect fourth.
Webster's New World

In music a tetrachord is any set of four different pitch classes.

Wiktionary

Other Word Forms of Tetrachord

Noun

Singular:
tetrachord
Plural:
tetrachords

Origin of Tetrachord

  • Greek tetrakhordon from neuter of tetrakhordos four-stringed tetra- tetra- khordē string gherə- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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tetrachord