/ Dictionary / Index R rosaceous: Meaning and Definition of Find definitions for: ro•sa•ceous Pronunciation: (rō-zā'shus), [key] — adj. belonging to the plant family Rosaceae. Cf. having a corolla of five broad petals, like that of a rose. like a rose; roselike: rosaceous loveliness. rose-colored; rosy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rosaceous (Thesaurus) rosacea Rosalie 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