/ Dictionary / Index P polysyllable: Meaning and Definition of Find definitions for: pol•y•syl•la•ble Pronunciation: (pol'ē-sil"u-bul, pol"ē-sil'-), [key] — n. a polysyllabic word. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polysyllable (Thesaurus) polysyllabic polysyllogism Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language