Source : Webster's Revised Unabridged Dictionary (1913)

Plasmodium \Plas*mo"di*um\, n.; pl. {Plasmodia}. [NL. See
   {Plasma}.]
   1. (Biol.) A jellylike mass of free protoplasm, without any
      union of am[oe]boid cells, and endowed with life and power
      of motion.

   2. (Zo["o]l.) A naked mobile mass of protoplasm, formed by
      the union of several am[oe]balike young, and constituting
      one of the stages in the life cycle of Mycetozoa and other
      low organisms.

Source : WordNet®

plasmodium
     n 1: multinucleate sheet of cytoplasm characteristic of some
          stages of such organisms as slime molds
     2: parasitic protozoan of the genus Plasmodium that causes
        malaria in humans [syn: {Plasmodium vivax}, {malaria
        parasite}]
     [also: {plasmodia} (pl)]

plasmodia
     See {plasmodium}