tetrachord

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tet·ra·chord

 (tĕt′rə-kôrd′)
n. Music
A series of four diatonic tones encompassing the interval of a perfect fourth.

[Greek tetrakhordon, from neuter of tetrakhordos, four-stringed : tetra-, tetra- + khordē, string; see gherə- in Indo-European roots.]

tet′ra·chor′dal (-kôr′dl) adj.

tetrachord

(ˈtɛtrəˌkɔːd)
n
(Music, other) (in musical theory, esp of classical Greece) any of several groups of four notes in descending order, in which the first and last notes form a perfect fourth
[C17: from Greek tetrakhordos four-stringed, from tetra- + khordē a string]
ˌtetraˈchordal adj

tet•ra•chord

(ˈtɛ trəˌkɔrd)

n.
a diatonic series of four tones, the first and last separated by a perfect fourth.
[1595–1605; < Greek tetráchordos having four strings. See tetra-, chord1]
tet`ra•chor′dal, adj.