/ Dictionary / Index R rain gauge: Meaning and Definition of Find definitions for: rain' gauge" Pronunciation: [key] an instrument for measuring rainfall. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rain frog Rainier 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