Definition of nostril fly in English:

nostril fly

Line breaks: nos|tril fly

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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Pronunciation: ˈbɪmb(ə)l
verb
walk or travel at a leisurely pace