Definition of screw worm in English:

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screw worm

noun

1A worm gear or other mechanical device bearing a screw.
2A large American blowfly larva which enters the wounds of mammals and sometimes humans, developing under the skin and often causing death. The adult fly is called the screw-worm fly.
  • Cochliomyia (or Callitroga) hominivorax, family Calliphoridae.

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