polysyllabic
1. [ adjective ] having or characterized by words of more than three syllables
Related terms: syllabic
2. [ adjective ] (of words) long and ponderous; having many syllables
Synonyms: sesquipedalian
Examples:

"sesquipedalian technical terms"

Related terms: long
Similar spelling:   polysyllable
  Polygalaceae
  polycillin