polysyllabic

from WordNet (r) 3.0 (2006)

polysyllabic
    adj 1: having or characterized by words of more than three
           syllables
    2: (of words) long and ponderous; having many syllables;
       "sesquipedalian technical terms" [syn: {polysyllabic},
       {sesquipedalian}]

from The Collaborative International Dictionary of English v.0.48

Polysyllabic \Pol`y*syl*lab"ic\, Polysyllabical
\Pol`y*syl*lab"ic*al\, a. [Gr. ?; poly`s many + ? syllable: cf.
   F. polysyllabique.]
   Pertaining to a polysyllable; containing, or characterized
   by, polysyllables; consisting of more than three syllables.
   [1913 Webster]