ectozoon

ec·to·zo·on

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


Origin:
1855–60; ecto- + -zoon

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ectozoon ec·to·zo·on (ěk'tə-zō'ŏn')
n. pl. ec·to·zo·a (-zō'ə)
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.
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00:10
Ectozoon is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a scrap or morsel of food left at a meal.
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