screwworm

screw·worm

noun \ˈskrü-ˌwərm\

Definition of SCREWWORM

1

: either of two dipteran flies of the genus Cochliomyia: a : one (C. hominivorax) of the warmer parts of America whose larva develops in sores or wounds or in the nostrils of mammals including humans with serious or sometimes fatal results; especially : its larva b : secondary screwworm

2

: a dipteran fly of the genus Chrysomyia (C. bezziana) that causes myiasis in the Old World