/ Dictionary / Index P protuberate: Meaning and Definition of Find definitions for: pro•tu•ber•ate Pronunciation: (prō-t'bu-rāt", -ty'-, pru-), [key] — -at•ed, -at•ing. to bulge out, forming a rounded projection. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: protuberate (Thesaurus) protuberant proturan Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language