1. Oestrus

noun. type genus of the Oestridae: sheep botflies.


  • sheep botfly
  • sheep gadfly
  • family Hypodermatidae
  • Oestrus ovis
  • genus Oestrus
  • Hypodermatidae
  • Oestridae
  • family Oestridae

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2. oestrus

noun. applies to nonhuman mammals: a state or period of heightened sexual arousal and activity.


  • physical condition
  • estrus
  • physiological condition
  • physiological state
  • rut


  • cool
  • coldness
  • unemotionality
  • hyperthermia

Sentences with oestrus

1. Verb, base form
There are four cycles to oestrus: proestrus, estrus, diestrus and anestrus.

2. Noun, singular or mass
When your border collie reaches 6 months of age, she will soon have her first oestrus, or "heat" cycle, which will occur approximately every seven months.

3. Adjective
False pregnancies in dogs occur about 6 to 12 weeks after a dog's oestrus cycle, or heat cycle.