Dictionary.com
definitions

diestrus

[dahy-es-truh s]

noun

(in female mammals) an interval of sexual inactivity between periods of estrus.
Also British dioestrus.

Origin of diestrus

First recorded in 1940–45; di-3 + estrus
Related formsdi·es·trous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for diestrus

diestrus

noun

the US spelling of dioestrus
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
diestrus in Medicine

diestrus

[dī-ĕs′trəs]

n.

The period of sexual quiescence intervening between two periods of estrus.
Related formsdi•es′trous (-trəs) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.