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polysyllabic (adj.)

1650s (implied in polysyllabical), from Medieval Latin polysyllabicus, from Greek polysyllabikos; see poly- "much, many" + syllabic.

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Definitions of polysyllabic from WordNet

polysyllabic (adj.)
having or characterized by words of more than three syllables;
polysyllabic (adj.)
(of words) long and ponderous; having many syllables;
Synonyms: sesquipedalian
From wordnet.princeton.edu