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screw·worm

n 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 : esp  :  its larva  b  :  SECONDARY SCREWWORM  2  :  a dipteran fly of the genus Chrysomyia (C. bezziana) that causes myiasis in the Old World .
 
 

 
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