/ Dictionary / Index R Riis: Meaning and Definition of Find definitions for: Riis Pronunciation: (rēs), [key] 1849–1914, U.S. journalist and social reformer, born in Denmark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. R.I.I.A. Rijeka Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language