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Definition of oestrus noun from the Oxford Advanced Learner's Dictionary

 

oestrus

 noun
(British English) (North American English estrus) noun
BrE BrE//ˈiːstrəs//
 
; NAmE NAmE//ˈestrəs//
 
[uncountable] (specialist)
 
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a period of time in which a female animal is ready to have sex Word Origin late 17th cent.: from Greek oistros ‘gadfly or frenzy’.

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