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proestrus

[proh-es-truh s] /proʊˈɛs trəs/
noun
1.
the period immediately preceding estrus.
Also, pro-oestrus.
Origin
1920-1925
1920-25; pro-1 + estrus
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for proestrus

proestrus

/prəʊˈɛstrəs; -ˈiːstrəs/
noun
1.
the usual US spelling of pro-oestrus

pro-oestrus

/prəʊˈiːstrəs; -ˈɛstrəs/
noun
1.
the period in the oestrous cycle that immediately precedes oestrus
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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proestrus in Medicine

proestrus pro·es·trus (prō-ěs'trəs)
n.
The period immediately before estrus in most female mammals, characterized by development of the endometrium and ovarian follicles.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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