/ Dictionary / Index R rain forest: Meaning and Definition of Find definitions for: rain' for"est Pronunciation: [key] a tropical forest, usually of tall, densely growing, broad-leaved evergreen trees in an area of high annual rainfall. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rainforest (Thesaurus) rainfall rain frog 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