- the encysted zygotic stage in the life cycle of some sporozoans.
Origin of oocyst
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for oocyst
Immediately after the formation of the antheridia new productions show themselves, both around the oocyst and within it.Fungi: Their Nature and Uses
Mordecai Cubitt Cooke
The order Coccidiidea is divided into four families, characterized by the number of sporocysts (if any) found in the oocyst.
In one case (Coccidium mitrarium), the oocyst itself, instead of being spherical, is curiously shaped like a mitre.
No sporozoites are formed in the oocyst, the sporozoites being unenclosed (gymnospores).
- 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
- 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.