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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Tetrachord \Tet"ra*chord\, noun [L. tetrachordon, Gr. ?, from ? four-stringed; te'tra- (see {Tetra-}) + ? a chord: cf. F. t['e]trachorde.] (Anc. Mus.) 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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