/ Dictionary / Index R Rous sarcoma: Meaning and Definition of Find definitions for: Rous' sarco"ma Pronunciation: (rous), [key] — Vet. Pathol. Vet. Pathol. a malignant tumor occurring in the connective tissue of poultry, caused by a transmissible RNA-containing virus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rousing Rousseau 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