Polysyllabical :: Polysyllabical (a.) Pertaining to a polysyllable; containing, or characterized by, polysyllables; consisting of more than three syllables..
Polysyllabism :: Polysyllabism (n.) The quality or state of being polysyllabic.
Polysyllable :: Polysyllable (n.) A word of many syllables, or consisting of more syllables than three; -- words of less than four syllables being called monosyllables, dissyllables, and trisyllables..