/ Dictionary / Index P plasmodium: Meaning and Definition of Find definitions for: plas•mo•di•um Pronunciation: (plaz-mō'dē-um), [key] — pl. -di•a an ameboid, multinucleate mass or sheet of cytoplasm characteristic of some stages of organisms, as of myxomycetes or slime molds. any parasitic protozoan of the genus Plasmodium, causing malaria in humans. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plasmodium (Thesaurus) plasmodiocarp plasmogamy Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language