tetra-chordal

tetrachord

[te-truh-kawrd]
noun Music.
a diatonic series of four tones, the first and last separated by a perfect fourth.

Origin:
1595–1605; < Greek tetráchordos having four strings. See tetra-, chord1

tetrachordal, adjective
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tetrachord (ˈtɛtrəˌkɔːd)
 
n
(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]
 
tetra'chordal
 
adj

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