Polysyllable
Pronunciation : Pol"y*syl`la*ble
Part of Speech : n.
Etymology : [Poly- + syllable.]
Definition : Defn: A word of many syllables, or consisting of more syllables than three; -- words of less than four syllables being called monosyllables, dissyllables, and trisyllables.
Source : Webster's Unabridged Dictionary, 1913