Definify.com
Webster 1913 Edition
Plasmodium
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1.
(Biol.)
A jellylike mass of free protoplasm, without any union of amœboid cells, and endowed with life and power of motion.
2.
(Zool.)
A naked mobile mass of protoplasm, formed by the union of several amœbalike young, and constituting one of the stages in the life cycle of Mycetozoa and other low organisms.