[ep-uh-zoh-on, -uhn]
noun, plural epizoa [ep-uh-zoh-uh] . Biology.
an external parasite or commensal on the body of an animal; ectozoon.
Also, epizoite.

1830–40; < Neo-Latin; see epi-, -zoon

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World English Dictionary
epizoite (ˌɛpɪˈzəʊɪt)
an organism that lives on an animal but is not parasitic on it

epizoon (ˌɛpɪˈzəʊɒn)
n , pl -zoa
an animal, such as a parasite, that lives on the body of another animal
[C19: New Latin, from epi- + Greek zōion animal]

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Medical Dictionary

epizoon ep·i·zo·on (ěp'ĭ-zō'ŏn, -ən)
n. pl. ep·i·zo·a (-zō'ə)
An epizoic organism.

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