/ Dictionary / Index M myxomatosis: Meaning and Definition of Find definitions for: myx•o•ma•to•sis Pronunciation: (mik"su-mu-tō'sis), [key] — n. a condition characterized by the presence of many myxomas. myxomatous degeneration. a highly infectious viral disease of rabbits, artificially introduced into Great Britain and Australia to reduce the rabbit population. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: myxomatosis (Thesaurus) myxoma myxomycete 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