/ Dictionary / Index R royster: Meaning and Definition of Find definitions for: royst•er Pronunciation: (roi'stur), [key] — v.i. roister. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Roy Rogers rozener Related Content Daily Word Quiz: prevalent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language