tet·ra·chord (t t r -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- + khord  , string; see gher- in Indo-European roots.]tet ra·chordal (-kôrdl) 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
[from Greek tetrakhordos four-stringed, from tetra- + khordē a string]
tetrachordal adj
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