entozoon

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

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 existence of entozoa, or parasitic animals, found in the interior of the bodies of other animals, and found nowhere else, is thought to support the same doctrine.

From A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' by Francis Bowen

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

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

Then it was alleged that the entozoa, the worms found in the bodies of animals, were self-produced, without eggs, until the microscope discovered that one could lay 60,000 eggs.

From Fables of Infidelity and Facts of Faith Being an Examination of the Evidences of Infidelity by Robert Patterson

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