/ Dictionary / Index R Rion Strait: Meaning and Definition of Find definitions for: Ri'on Strait' Pronunciation: (rē'on Gk. rē'ôn), [key] Lepanto (def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Rio Negro Riopelle Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language