/ Dictionary / Index A actinomycosis: Meaning and Definition of Find definitions for: ac•tin•o•my•co•sis Pronunciation: (ak-tin"ō-mī-kō'sis, ak"tu-nō-), [key] — n. Vet. Pathol., Pathol. an infectious, inflammatory disease caused by Actinomyces israelii in humans and A. bovis in domestic animals, and characterized by lumpy, often suppurating tumors, esp., about the jaws. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: actinomycosis (Thesaurus) actinomycin D actinon Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language