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(), n.[L. tetrachordon, Gr. , from four-stringed; te°tra- (see Tetra-) + a chord: cf. F. ttrachorde.] (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. スポンサード リンク
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