/ Dictionary / Index A actinomyces: Meaning and Definition of Find definitions for: ac•tin•o•my•ces Pronunciation: (ak-tin"ō-mī'sēz, ak"tu-nō-), [key] — pl. -ces. any of several saprophytic, filamentous, anaerobic bacteria of the genus Actinomyces, certain species of which are pathogenic for humans and animals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: actinomyces (Thesaurus) actinomorphic actinomycete 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