/ Dictionary / Index R rosarium: Meaning and Definition of Find definitions for: ro•sar•i•um Pronunciation: (rō-zâr'ē-um), [key] — pl. -i•ums, -i•a a rose garden. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Rosario rosary Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language