estrus

Multiple Entries:
  estrus    oestrus  

Concise Oxford English Dictionary © 2008 Oxford University Press:
estrus etc.
noun US spelling of oestrus etc.

Concise Oxford English Dictionary © 2008 Oxford University Press:
oestrus /ˈiːstrəs, ˈɛstrəs/ (US estrus)
noun a recurring period of sexual receptivity and fertility in many female mammals; heat.
– derivatives
oestrous adjective.
– origin C17: from Gk oistros ‘gadfly or frenzy’.
'estrus' also found in these Oxford entries:

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