tetrachord(redirected from tetrachordal)
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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.
(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]
a diatonic series of four tones, the first and last separated by a perfect fourth.