The Collaborative International Dictionary of English v.0.48:
Dissyllable \Dis*syl"la*ble\ (?; 277), n. [F. dissyllabe, L. disyllabus, adj., of two syllables, fr. Gr. ?; di- = di`s- twice + ? syllable. See Syllable.] A word of two syllables; as, pa-per. [1913 Webster]WordNet (r) 3.0 (2006):
dissyllable n 1: a word having two syllables [syn: disyllable, dissyllable]