/ Dictionary / Index T tartar sauce: Meaning and Definition of Find definitions for: tar'tar sauce" Pronunciation: [key] a mayonnaise dressing for fish and seafood, usually with chopped pickles, onions, olives, capers, and green herbs added. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tartarous tartar steak Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language