Lewis & Short

ĕnarmŏnius (ĕnhar-, also -monĭ-cus), a, um, adj., = ἐναρμόνιος, enharmonic; as subst. (sc. melodiae genus), = ἐναρμόνιον μέλος, the technical name in Greek music of a kind of melody, in which quarter-tones predominated, Mart. Cap. 9, § 930: modulatio, id. 9, § 942 al.; Macr. Somn. Scip. 2, 4, 13.