/ Dictionary / Index M microbicide: Meaning and Definition of Find definitions for: mi•cro•bi•cide Pronunciation: (mī-krō'bu-sīd"), [key] — n. a substance or preparation for killing microbes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. microbe microbiology 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