/ Dictionary / Index R rosulate: Meaning and Definition of Find definitions for: ro•su•late Pronunciation: (rō'zu-lit, roz'u-), [key] — adj. Bot. forming a rosette or rosettes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rostrum Roswell 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