Monocystis
noun
Mono·cys·tis
| \ -ˈsistə̇s\
Definition of Monocystis
: a genus (the type of the family Monocystidae) of acephaline gregarines not having the protoplasm divided into segments by septa and including internal parasites of invertebrates (as M. agilis of the reproductive system of earthworms)
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