/ Dictionary / Index M microbe: Meaning and Definition of Find definitions for: mi•crobe Pronunciation: (mī'krōb), [key] — n. a microorganism, esp. a pathogenic bacterium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: microbe (Thesaurus) microbarograph microbicide Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language