Definition of screwworm in US English:

screwworm

noun

  • A large American blowfly larva that enters the wounds of mammals, developing under the skin and often causing death. The adult fly is called the screwworm fly.

    Cochliomyia or 'Callitroga' hominivorax, family Calliphoridae

Pronunciation

screwworm

/ˈskro͞oˌwərm/