disemic, a. (daɪˈsiːmɪk) [f. L. disēmus disyllabic, a. Gr. δίσηµος of doubtful quantity (f. δι- (di-2) twice + σῆµα a sign) + -ic.] In Gr. and Lat. Prosody: Of the value of two moræ or units of time (cf. trisemic).
Oxford English Dictionary