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ectozoon

[ek-tuh-zoh-on, -uh n]
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noun, plural ec·to·zo·a [ek-tuh-zoh-uh] /ˌɛk təˈzoʊ ə/. Biology.
  1. any animal parasite, as the louse, that lives on the surface of its host (opposed to entozoon).
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Also ectozoan.

Origin of ectozoon

First recorded in 1855–60; ecto- + -zoon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

ectozoon in Medicine

ectozoon

(ĕk′tə-zōŏn′)
n. pl. ec•to•zo•a (-zōə)
  1. An animal parasite, such as a flea or louse, living on the exterior of the host organism.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.