Tetrachord

In music theory, traditionally, a tetrachord (τετράχορδoν, tetrachordum) is a series of three smaller intervals that span the interval of a perfect fourth, a 4:3 frequency proportion. In modern usage a tetrachord is any four-note segment of a scale or tone row, not necessarily related to a particular system of tuning. ==History== The ter...
Found on http://en.wikipedia.org/wiki/Tetrachord

Tetrachord

• (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.
Found on http://thinkexist.com/dictionary/meaning/tetrachord/

Tetrachord

Tet'ra·chord noun [ Latin tetrachordon , Greek ..., from ... four-stringed; te`tra- (see Tetra- ) + ... a chord: confer French tétrachorde .] (Anc. Mus.) A scale series of four sounds, of which the extremes, or first and last, constituted a fourth. These extreme...
Found on http://www.encyclo.co.uk/webster/T/34

tetrachord

a four-tone section of a scale.
Found on https://www.encyclo.co.uk/local/22288

tetrachord

musical scale of four notes, bounded by the interval of a perfect fourth (an interval the size of two and one-half steps, e.g., c–f). In ancient ... [3 related articles]
Found on http://www.britannica.com/eb/a-z/t/30
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