a. 三音节的

Trisyllabic \Tris`yl*lab"ic\, Trisyllabical \Tris`yl*lab"ic*al\,
a. [L. trisyllabus, Gr. ?; ? (see {Tri-}) + ? a syllable: cf.
F. trissyllabique.]
Of or pertaining to a trisyllable; consisting of three
syllables; as, ``syllable'' is a trisyllabic word. --
{Tris`yllab"ic*al*ly}, adv.