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oestrus
Definitions
[ˈɛstrəs], (Noun)
Definitions:
- a recurring period of sexual receptivity and fertility in many female mammals; heat
(e.g: a mare in oestrus)
Phrases:
Origin
:
late 16th century (denoting a gadfly): via Latin from Greek oistros ‘gadfly or frenzy’. The sense ‘period of sexual receptivity and fertility’ dates from the late 19th century
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definition by Oxford Dictionaries