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oocyst

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

First recorded in 1870–75; oo- + -cyst
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for oocyst

oocyst

noun
  1. an encysted zygote of sporozoan protozoans that undergoes sporogony to produce infective sporozoites
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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

oocyst in Medicine

oocyst

ə-sĭst′)
n.
  1. A thick-walled structure in which sporozoan zygotes develop and that serves to transfer them to new hosts.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.