entozoon

from WordNet (r) 3.0 (2006)

entozoon
    n 1: any of various parasites that live in the internal organs
         of animals (especially intestinal worms) [syn:
         {endoparasite}, {entoparasite}, {entozoan}, {entozoon},
         {endozoan}]

from The Collaborative International Dictionary of English v.0.48

Entozoon \En`to*zo"["o]n\, n.; pl. {Entozoa}. [NL. See
   {Entozoa}.] (Zo["o]l.)
   One of the Entozoa.
   [1913 Webster]

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