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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 oestrus
 發情,牛虻

From: Webster's Revised Unabridged Dictionary (1913)

 oes·trus n.
 1. Zool. A genus of gadflies. The species which deposits its larvae in the nasal cavities of sheep is oestrus ovis.
 2. A vehement desire.
 3. Specifically: Physiol. The periodical sexual impulse of animals; the period during which female animals are most receptive to males; heat; rut.
 

From: WordNet (r) 2.0

 oestrus
      n 1: applies to nonhuman mammals: a state or period of heightened
           sexual arousal and activity [syn: estrus, heat, rut]
           [ant: anestrus]
      2: type genus of the Oestridae: sheep botflies [syn: genus
         Oestrus]