/ Dictionary / Index R rain cloud: Meaning and Definition of Find definitions for: rain' cloud" Pronunciation: [key] a cloud or a mass of clouds that yields rain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rain check raincoat 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