Trisyllabic
Trisyllabic , adjective
[Latin trisyllabus, Greek {not transcribed}; {not transcribed} (see Tri-) + {not transcribed} a syllable: compare French trissyllabique.]
Of or pertaining to a trisyllable; consisting of three syllables; as, “syllable” is a trisyllabic word.
Also: Trisyllabical