octatonic
adjective
variants:
or less commonly octotonic
Definition of octatonic
: relating to or employing an eight-note scale made up of alternating semitones and whole tones
… a French sixth chord, which contains two tritones, acts as a nexus between the whole-tone scale, which contains three, and the octatonic scale, which contains four.— Richard Taruskin, Music in the Early Twentieth Century, 2009
— see scale
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