/ Dictionary / Index M macrophage: Meaning and Definition of Find definitions for: mac•ro•phage Pronunciation: (mak'ru-fāj"), [key] — n. Cell Biol. a large white blood cell, occurring principally in connective tissue and in the bloodstream, that ingests foreign particles and infectious microorganisms by phagocytosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: macrophage (Thesaurus) macroorganism macrophysics Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language