/ Dictionary / Index R rainbow fish: Meaning and Definition of Find definitions for: rain'bow fish" Pronunciation: [key] guppy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rainbow darter rainbow roof Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language