/ Dictionary / Index R rosace: Meaning and Definition of Find definitions for: ro•sace Pronunciation: (rō-zās', -zäs'), [key] — n. rosette (def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Rosa rosacea Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language