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Wiktionary
estrous

a. Of, pertaining to, or in a state of estrus.

WordNet
estrous

adj. (of lower mammals) showing or in a state of estrus; in heat; "the estrous state"; "the estrous cycle" [ant: anestrous]

Wikipedia

Usage examples of "estrous".

The best-documented exception to this pattern of public sex is in chimpanzee troops, where an adult male and estrous female may go off by themselves for a few days on what human observers term a "consortship.

Most other animal species confine sex to a brief estrous period around the advertised time of ovulation.

With the use of a new estrogen compound, it would be relatively simple to synchronize the estrous cycles of the two women.

Since coitus takes place only during the period of fertility, the chance of conception is high, as with all mammals that have an estrous cycle.

Seemed like years, waiting three weeks at a time for some bureaucrat to get over her estrous cycle so we could get an appointment.

Male hominoids are visually activatedchimpanzees, by rosy, estrous colors.

Male hominoids are visually activated—chimpanzees, by rosy, estrous colors.