/ Dictionary / Index R Ratisbon: Meaning and Definition of Find definitions for: Rat•is•bon Pronunciation: (rat'is-bon", -iz-), [key] — n. Regensburg. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ratio test ratite Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language