Definition of octatonic in US English:

octatonic

adjective

Music
  • Designating a scale of eight notes made up of alternating tone and semitone intervals. Of a composition or musical style: based on or using octatonic scales.

Origin

1960s. From octa- + tonic, after tone.

Pronunciation

octatonic

/ˌɒktəˈtɒnɪk/