Entozoa
Entozoa , noun, plural
[New Latin, from Greek {not transcribed} within + zw^,on an animal.]
1.
(Zoology) A group of worms, including the tapeworms, flukes, roundworms, etc., most of which live parasitically in the interior of other animals; the Helminthes.
2.
An artificial group, including all kinds of animals living parasitically in others.