/ Dictionary / Index R Rainier: Meaning and Definition of Find definitions for: Rai•nier Pronunciation: (ru-nēr', rā-, rā'nēr), [key] a volcanic peak in W Washington, in the Cascade Range. 14,408 ft. (4392 m). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rainier (Thesaurus) rain gauge Rainier III 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