[ ek-tuh-zoh-on, -uhn ]
/ ˌɛk təˈzoʊ ɒn, -ən /
Save This Word!

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).
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help
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. 2022

How to use ectozoon in a sentence

  • The most common ectozoon is the hog louse (Hmatopinus suis).

    Parasites|T. Spencer Cobbold
  • Another ectozoon, placed by Mgnin and others amongst the lowest types of Arachnida, is the well-known Demodex folliculorum.

    Parasites|T. Spencer Cobbold

Medical 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.