τριημιτόνιον

α, ον, τό
A. a tone and a half: in Music, minor third, Cleonid. Harm. 3, Plu. 2.389e, 430a:—hence τριημι‐τονιαῖος, α, ον , διάστημα Gaud.Harm. 3, Theo Sm.p.54 H., cf. p.141H.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project