/ Dictionary / Index R rosacea: Meaning and Definition of Find definitions for: ro•sa•ce•a Pronunciation: (rō-zā'shē-u), [key] — n. Pathol. a chronic form of acne affecting the nose, forehead, and cheeks, characterized by red pustular lesions. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rosacea (Thesaurus) rosace rosaceous Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language