/ Dictionary / Index M mycobacterium: Meaning and Definition of Find definitions for: my•co•bac•te•ri•um Pronunciation: (mī"kō-bak-tēr'ē-um), [key] — pl. -te•ri•a any of several rod-shaped aerobic bacteria of the genus Mycobacterium, certain species of which, as M. tuberculosis, are pathogenic for humans and animals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mycobacterium (Thesaurus) myco- mycobiont Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language