oocyst

[oh-uh-sist]
noun Biology.
the encysted zygotic stage in the life cycle of some sporozoans.

Origin:
1870–75; oo- + -cyst

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Collins
World English Dictionary
oocyst (ˈəʊəˌsɪst)
 
n
an encysted zygote of sporozoan protozoans that undergoes sporogony to produce infective sporozoites

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

oocyst o·o·cyst (ō'ə-sĭst')
n.
A thick-walled structure in which sporozoan zygotes develop and that serves to transfer them to new hosts.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And the third type targets the oocyst, a stage in the life cycle of the parasite that occurs only in the mosquito.
Experimental design for determining oocyst inactivation rates in fecal pools.
In the oocyst stage, crypto is extremely resistant to disinfection.
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