Definify.com

Webster 1913 Edition

Noun.

[

Hexa-

+ Gr. [GREEK] string, chord: cf. F.

hexacorde

(Mus.)

A series of six notes, with a semitone between the third and fourth, the other intervals being whole tones.

Noun.

[Gr. six and a chord.] In ancient music, an imperfect chord called a sixth. Also, an instrument of six chords, or system of six sounds.

hexachord ‎(plural hexachords)

(music) A series of six tones denoted with the syllables ut-re-mi-fa-sol-la separated by seconds, the only of which that is a minor second being mi-fa.