Definition of nostril fly in English:

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nostril fly

Entry from British & World English dictionary

noun

A parasitic fly that lays its eggs in the nostrils of sheep, goats, and deer. The larvae develop in the nasal cavities before being sneezed out.
  • The sheep nostril fly or sheep bot (Oestrus ovis) and the deer nostril flies (genus Cephenemyia), both in the family Oestridae
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