/ Dictionary / Index R rainstorm: Meaning and Definition of Find definitions for: rain•storm Pronunciation: (rān'stôrm"), [key] — n. a storm with heavy rain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rainstorm (Thesaurus) rainsquall rain tree Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language