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[oh-uh-sist] /ˈoʊ əˌsɪst/
noun, Biology
the encysted zygotic stage in the life cycle of some sporozoans.
Origin of oocyst
1870-75; oo- + -cyst Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for oocyst
  • 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.
British Dictionary definitions for oocyst


an encysted zygote of sporozoan protozoans that undergoes sporogony to produce infective sporozoites
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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oocyst in Medicine

oocyst o·o·cyst (ō'ə-sĭst')
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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