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estranged
estreat
estriol
estrogen
estrogen-replacement therapy
estrone
estrous
estrous cycle
estrus
estuarine
estuary
Estuary English
esu
esurient
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estrus
es·trus [ éstrəss ] or oes·trus [ éstrəss ]


noun 
Definition:
 
sexual heat: a regular period of sexual excitement in many female mammals, during which the animal seeks to mate
[Late 19th century. Via Latin oestrus "frenzy" < Greek oistros "gadfly"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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