/ Dictionary / Index R red hat: Meaning and Definition of Find definitions for: red' hat' Pronunciation: [key] the broad-brimmed official hat of a Roman Catholic cardinal, symbolic of the office or rank of a cardinal. a cardinal. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. red-handed Red Hats Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language