Etymology
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estrus (n.)

1850, "frenzied passion," from Latin oestrus "frenzy, gadfly," from Greek oistros "gadfly; breeze; sting; anything which makes one mad, mad impulse," perhaps from a PIE *eis- (1), forming words denoting passion (see ire). First attested 1890 with specific meaning "rut in animals, sexual heat." Earliest use in English (1690s) was for "a gadfly." Related: Estrous (1900).

updated on February 02, 2015

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Definitions of estrus from WordNet

estrus (n.)
applies to nonhuman mammals: a state or period of heightened sexual arousal and activity;
Synonyms: oestrus / heat / rut
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.