/ Dictionary / Index R rex*: Meaning and Definition of Find definitions for: rex Pronunciation: (reks Eng. reks), [key] — pl. re•ges king. Rex Pronunciation: (reks), [key] a Belgian fascist party founded in 1935. Rex Pronunciation: (reks), [key] a male given name. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rewriterule rex begonia Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language