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estrus

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Estrus is the period of sexual heat in a female. (noun)

An example of estrus is the period of time when a female animal is looking for a sexual mate.

See estrus in Webster's New World College Dictionary

noun

the periodic sexual excitement of most female placental mammals, corresponding to rut in males; heat
the period of this when the female will accept mating with the male, characterized by changes in the sex organs

Also estrum

See estrus in American Heritage Dictionary 4

also oes·trus (ĕsˈtrəs)

noun

The periodic state of sexual excitement in the female of most mammals, excluding humans, that immediately precedes ovulation and during which the female is most receptive to mating; heat.

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