'Trisyllable' definitions:

Definition of 'trisyllable'

From: WordNet
noun
A word having three syllables

Definition of 'Trisyllable'

From: GCIDE
  • Trisyllable \Tri*syl"la*ble\, n. [Pref. tri- + syllable.] A word consisting of three syllables only; as, a-ven-ger. [1913 Webster]