Etymology
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oestrus (n.)

see estrus.

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Definitions of oestrus
1
oestrus (n.)
applies to nonhuman mammals: a state or period of heightened sexual arousal and activity;
Synonyms: estrus / heat / rut
2
Oestrus (n.)
type genus of the Oestridae: sheep botflies;
Synonyms: genus Oestrus
From wordnet.princeton.edu