Estrus definitions

ĕs'trəs
The periodic sexual excitement of most female placental mammals, corresponding to rut in males; heat.
noun
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The period of this when the female will accept mating with the male, characterized by changes in the sex organs.
noun
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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.
noun
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Estrus is defined as the period of sexual heat in a female.

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

noun
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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.
noun
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A regularly recurring period in female mammals other than humans during which the animal is sexually receptive. Estrus occurs around the time of ovulation.
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(American) Alternative spelling of oestrus.
noun
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Origin of estrus

New Latin from Latin oestrus frenzy, gadfly from Greek oistros eis- in Indo-European roots