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.
References in periodicals archive ?
In the introduction to the piano-vocal score, JensenMoulton describes how Gideon created principal motives for the opera by employing subsets of these collections (many of which contain an intervallic overlap), particularly on the trichordal and tetrachordal level.
He deprecated it as being misleading on two counts: because of its `perverse tetrachordal arrangement' and because of the `perverse disjunction' that results from this.
This BACH motive, as he explains, is one of several chromatic tetrachordal lines that combine to form the aggregate.
In the end, in spite of Kahan's meticulous and thorough research, she is unable to pinpoint the cause behind Polignac's discovery; his adventurous nature combined with a thorough mathematical training and exposure to Greek tetrachordal theory are cited as the most likely catalysts.
As the movement continues to gain vital force, this drone is transformed into the pizzicato foundation of a minimalist passage that gradually unfolds an imitative tetrachordal cluster and expands to a maestoso conclusion.