hexachord

[ hek-suh-kawrd ]

/ ˈhɛk səˌkɔrd /

a diatonic series of six tones having, in medieval music, a half step between the third and fourth tones and whole steps between the others.

Origin of hexachord

First recorded in 1685–95, hexachord is from the Late Greek word hexáchordos having six strings. See hexa-, chord¹

Solmisation of the six notes of the Hexachord, 11th century, see p. 37.

Shakespeare and Music |Edward W. Naylor
Hexachord, hek′sa-kord, n. a diatonic series of six notes, having a semitone between the third and fourth.

Chambers's Twentieth Century Dictionary (part 2 of 4: E-M) |Various
For the fourth hexachord, which was called hard, this B was again raised a semitone.

Critical & Historical Essays |Edward MacDowell

hexachord

/ (ˈhɛksəˌkɔːd) /

(in medieval musical theory) any of three diatonic scales based upon C, F, and G, each consisting of six notes, from which solmization was developed