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proestrus

American  
[proh-es-truhs] / proʊˈɛs trəs /
especially British, pro-oestrus

noun

Zoology.

  1. (in female mammals) the first stage of the reproduction cycle, immediately preceding estrus.

proestrus British  
/ -ˈiːstrəs, prəʊˈɛstrəs /

noun

  1. the usual US spelling of pro-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

Etymology

Origin of proestrus

First recorded in 1920–25; pro- 1 + estrus

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.