[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