ENTOZOON

endoparasite, entoparasite, entozoan, entozoon, endozoan

(noun) any of various parasites that live in the internal organs of animals (especially intestinal worms)

Source: WordNet® 3.1

Noun

entozoon (plural entozoons or entozoa)

(obsolete) Any of various microscopic parasitic worms previously classified together under the grouping Entozoa.

Source: Wiktionary

En`to*zo"ön, n.; pl. Entozoa. Etym: [NL. See Entozoa.] (Zoöl.)

Definition: One of the Entozoa.

Source: Webster’s Unabridged Dictionary 1913 Edition