tetrachord

noun
tet·​ra·​chord | \ˈte-trə-ˌkȯrd \

Definition of tetrachord 

: a diatonic series of four tones with an interval of a perfect fourth between the first and last

First Known Use of tetrachord

1603, in the meaning defined above

History and Etymology for tetrachord

Greek tetrachordon, from neuter of tetrachordos of four strings, from tetra- + chordē string — more at yarn

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The first known use of tetrachord was in 1603

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