\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.