diestrus

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

[DI(A)- + ESTRUS.]

diestrous di·es'trous adj.

(dī-ĕs'trəs) or di·es·trum (-trəm)
n.

The period of sexual quiescence intervening between two periods of estrus.

di·es'trous (-trəs) adj.

The resting period between estral periods of animals. The female rejects the male, blood levels of estrogens are minimal and progesterone levels are high. This provides a physiological state in the uterus which is most conducive for implantation and growth of the developing fetus. Diestrus is terminated by luteolytic factors, such as prostaglandin F_2α secreted by the endometrium, if pregnancy does not occur.

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The noun has one meaning:

Meaning #1: (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity
  Synonym: diestrum

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