/ Dictionary / Index P protrusion: Meaning and Definition of Find definitions for: pro•tru•sion Pronunciation: (prō-tr'zhun, pru-), [key] — n. the act of protruding or the state of being protruded. something that protrudes or projects. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: protrusion (Thesaurus) protrusile protrusive Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language