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

1940–45; di-3 + estrus

diestrous, adjective
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World English Dictionary
diestrus (daɪˈiːstrəs)
the US spelling of dioestrus

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Medical Dictionary

diestrus di·es·trus (dī-ěs'trəs) or di·es·trum (-trəm)
The period of sexual quiescence intervening between two periods of estrus.

di·es'trous (-trəs) adj.
The American Heritage® Stedman's Medical Dictionary
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