quadri-syllabical

from The Collaborative International Dictionary of English v.0.48

Quadrisyllabic \Quad`ri*syl*lab"ic\, Quadri-syllabical
\Quad`ri-syl*lab"ic*al\,
   Having four syllables; of or pertaining to quadrisyllables;
   as, a quadrisyllabic word.
   [1913 Webster]