/ Dictionary / Index M microphone: Meaning and Definition of Find definitions for: mi•cro•phone Pronunciation: (mī'kru-fōn"), [key] — n. an instrument capable of transforming sound waves into changes in electric currents or voltage, used in recording or transmitting sound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: microphone (Thesaurus) microphage microphonic Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language