[ ek-tuh-zoh-on, -uh n ]
/ ˌɛk təˈzoʊ ɒn, -ən /

noun, plural ec·to·zo·a [ek-tuh-zoh-uh] /ˌɛk təˈzoʊ ə/. Biology.

any animal parasite, as the louse, that lives on the surface of its host (opposed to entozoon).

Nearby words

  1. ectothrix,
  2. ectotrophic,
  3. ectotrophic mycorrhiza,
  4. ectozoan,
  5. ectozoic,
  6. ectrin,
  7. ectro-,
  8. ectrocheiry,
  9. ectrodactylism,
  10. ectrodactyly

Also ectozoan.

Origin of ectozoon

First recorded in 1855–60; ecto- + -zoon Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Medicine definitions for ectozoon


[ ĕk′tə-zōŏn′ ]

n. pl. ec•to•zo•a (-zōə)

An animal parasite, such as a flea or louse, living on the exterior of the host organism.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.