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plasmodium plas·mo·di·um (plāz-mō'dē-əm)
n. pl. plas·mo·di·a (-dē-ə)
A multinucleate mass of cytoplasm formed by the aggregation of a number of amoeboid cells, as that characteristic of the vegetative phase of the slime molds.
A protozoan of the genus Plasmodium, which includes the parasites that cause malaria.
A genus of protozoans that are parasites of the red blood cells of vertebrates and include the causative agents of malaria.