Estrus
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Estrus (also œstrus) or heat in female mammals is the period of greatest female sexual responsiveness usually coinciding with ovulation. Most female mammals will only seek sex during their heat.
Etymology: The Latin oestrus, meaning frenzy, or gadfly. This in turn comes from the Greek oistros, which has the same meaning.
See also Endometrium This article is a stub. You can help Wikipedia by expanding it.