1A worm gear or other mechanical device bearing a screw.
涡轮；螺杆；带螺旋机件
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.
（次生）旋丽蝇幼虫
Cochliomyia or 'Callitroga' hominivorax, family Calliphoridae