Webster's Revised Unabridged Dictionary · 1913

Plasmodium

Plasmodium , noun

[New Latin See Plasma.]

1.
(Biology) A jellylike mass of free protoplasm, without any union of amoboid cells, and endowed with life and power of motion.
2.
(Zoology) A naked mobile mass of protoplasm, formed by the union of several amobalike young, and constituting one of the stages in the life cycle of Mycetozoa and other low organisms.