Tetrachord

[tetrәkɒ:d]

Definition

(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.

Typist: Stephanie

Definition

n. a series of four sounds forming a scale of two tones and a half.—adj. Tet′rachordal.

Typist: Moira