semitonal


sem·i·tone

S0259100 (sĕm′ē-tōn′, sĕm′ī-)n. Music An interval equal to a half tone in the standard diatonic scale. Also called half step, halftone.
sem′i·to′nal adj.sem′i·to′nal·ly adv.

semitonal

(ˈsɛmɪˌtəʊnəl) adj another word for semitonic