Definition of screwworm
1
: a blowfly (Cochliomyia 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
2
: any of several flies other than the screwworm and especially their larvae which parasitize the flesh of mammals
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Merriam-Webster unabridged
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Time Traveler for screwworm
The first known use of screwworm was in 1846
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