/ Dictionary / Index R rotavirus: Meaning and Definition of Find definitions for: ro•ta•vi•rus Pronunciation: (rō'tu-vī"rus), [key] — pl. -rus•es. a double-stranded RNA virus of the genus Rotavirus, family Reoviridae, that is a major cause of infant diarrhea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rotavirus (Thesaurus) rotatory R.O.T.C Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language