/ Dictionary / Index R riboso: Meaning and Definition of Find definitions for: ri•bo•so Pronunciation: (ri-bō'sō), [key] — pl. -sos. rebozo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ribose ribosomal RNA 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