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BNC: 47655 COCA: 0

oestrus

noun
/ˈiːstrəs/
/ˈestrəs/
(British English)
(North American English estrus)
[uncountable] (specialist)
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  1. a period of time in which a female animal is fertile and ready to have sex（雌性动物的）动情期 compare be on heat
    Word Originlate 17th cent.: from Greek oistros ‘gadfly or frenzy’.
BNC: 47655 COCA: 0
BNC: 47655 COCA: 0
BNC: 47655 COCA: 0

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