entozoon

It is a semi-transparent entozoon; each segment is long compared to its breadth, and narrowed at both ends.

From Dogs and All about Them by Robert Leighton

When you know the entozoon you can dig him out and save the sheep's life.

From Editorials from the Hearst Newspapers by Arthur Brisbane

The entozoon of course gives rise to a variety of stale and melancholy jokes about the early bird, the worm that dieth not, and so forth.

From Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2 by Sir Richard Francis Burton

An "entozoon" seems to the practical man a foolish, imaginary creature.

From Editorials from the Hearst Newspapers by Arthur Brisbane

Perhaps the prevailing doctrine is in nothing placed in greater difficulties than it is with regard to the entozoa, or creatures which live within the bodies of others. 

From Vestiges of the Natural History of Creation by Robert Chambers

But millions of sheep have been saved by the discovery that one of these fancy scientific entozoa, pressing on the brain, caused the sheep's death.

From Editorials from the Hearst Newspapers by Arthur Brisbane

Galvanism may bring gelatinous matter into the form of an insect, or infusoria, or entozoa; but there is no evidence that it can impart life, however exquisite the organization.

From The Religion of Geology and Its Connected Sciences by Edward Hitchcock

If, then, this view of the production of entozoa be received, it must be held as in no small degree favourable to the general doctrine of an organic creation by law.

From Vestiges of the Natural History of Creation by Robert Chambers

We also know that similar entozoa in their wanderings in the tissues by accident of location, or by disease, or injury of their organs, not infrequently give rise to grave lesions in their hosts.

From West African studies by Mary Henrietta Kingsley