/ Dictionary / Index R ratfink: Meaning and Definition of Find definitions for: rat•fink Pronunciation: (rat'fingk"), [key] — n. Slang. fink (defs. 3, 4). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rater ratfish Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language