/ Dictionary / Index R relief pitcher: Meaning and Definition of Find definitions for: relief' pitch"er Pronunciation: [key] — Baseball. Baseball. a pitcher brought into a game to replace another pitcher, often in a critical situation. a pitcher regularly so used, as opposed to one who regularly starts games. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. relief map relief valve Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language