The Collaborative International Dictionary of English v.0.48:

Endozoa \En`do*zo"a\ ([e^]n`d[-o]*z[=o]"[.a]), n. pl. [NL., fr.
   Gr. 'e`ndon within + zw^,on an animal.] (Zo["o]l.)
   See Entozoa.
   [1913 Webster]