from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. In female mammals, a short period of sexual quiescence between two estrus periods, during which the uterus is prepared for a fertilized ovum.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Alternative spelling of dioestrus.

from the GNU version of the Collaborative International Dictionary of English

  • n. a state or interval of sexual inactivity or quiescence between periods of activity; -- of animals having several estrous cycles in one breeding season.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity


di(a)- + estrus.
(American Heritage® Dictionary of the English Language, Fourth Edition)


  • After the eggs are released ovulation from the follicles, the follicles change from estrogen production to progesterone production and the dog enters a phase called diestrus.

    The Seattle Times

  • Smears were characterized as diestrus if mostly polymorphonuclear leukocytes were present, proestrus when mostly small nucleated and some cornified cells were present, and estrus when the smear was completely cornified.

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  • Since no males were present in this study, the females fed organic soy or no soy were appropriately untriggered (diestrus).

    Jeffrey Smith: Genetically Modified Soy Diets Lead to Ovary and Uterus Changes in Rats

  • - PGF 2α will not be secreted, CL lives, producing progesterone, diestrus will last the duration of pregnancy - synthetic PGF 2α given during diestrus will kill CL and return animal to proestrus immediately; if pregnant animal will have abortion 3.

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  • Hormones: - Progesterone is dominant hormone at this point - continued suppression of FSH/LH secretion by pituitary gland ensures quiescent ovary in case of pregnancy - progesterone levels maintain uterine development required to support pregnancy - during late diestrus (about day 17) uterus recognizes that is not pregnant:

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  • Mares which are in the ambivalent early stages of estrus or which are mistakenly in diestrus pose a clear safety threat in close quarters. News

  • When the mare is sexually inactive (during diestrus), the cervix is white, tightly contracted, and measures about 2. 4-3.1 inches (6-8 cm) long by 1. 6-2.0 inches (4-5 cm) wide. News

  • The cervix 'appearance is quite different during estrus than during diestrus (when the mare is not cycling). News

  • Magel-2 null females spend longer periods in estrus and diestrus, and experience fewer proestrus events (C-D).

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  • The stages of estrous can be easily distinguished cytologically, with nucleated smears during proestrus, cornified smears during estrus, and leukocytic smears during diestrus.

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