screwworm

noun

screw·​worm ˈskrü-ˌwərm How to pronounce screwworm (audio)
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

Examples of screwworm in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Though they are most commonly associated with animals, screwworm infections can have serious consequences for the health of humans. Yaakov Katz, Newsweek, 28 Nov. 2024 Screwworm infections are caused by parasitic larvae of fly species, most significantly the New World screwworm fly. Yaakov Katz, Newsweek, 28 Nov. 2024 The United States Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) announced that a New World screwworm (NWS) was detected in Mexico on Friday, causing the agency to pause animal imports from the country. Ashleigh Fields, The Hill, 26 Nov. 2024 Sterilized male screwworms are released to mate with females, which lay eggs that don’t hatch. Emily Mullin, WIRED, 28 June 2023 The successful screwworm campaign relied on blasts of radiation to sterilize the males. Nathaniel Scharping, Discover Magazine, 11 May 2017 Since the 1950s, the US government has used it to tamp down screwworms, parasitic flies that feed on the flesh of livestock. Emily Mullin, WIRED, 28 June 2023 The technique is so effective, the US was able to completely eradicate the screwworm (Cochliomyia hominivorax) in 1982. Christie Wilcox, Discover Magazine, 27 Jan. 2015 Primary myiasis is caused by the screwworm’s fly cousins and involves a deliberate breach of skin and tissue by larvae. Rebecca Kreston, Discover Magazine, 22 July 2013

Word History

First Known Use

1846, in the meaning defined at sense 1

Time Traveler
The first known use of screwworm was in 1846

Dictionary Entries Near screwworm

Cite this Entry

“Screwworm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/screwworm. Accessed 24 Dec. 2024.

Kids Definition

screwworm

noun
screw·​worm ˈskrü-ˌwərm How to pronounce screwworm (audio)
: the larva of a blowfly of the warm parts of America that develops in the wounds or sores of mammals and may cause disease or death
also : the blowfly itself

Medical Definition

screwworm

noun
screw·​worm ˈskrü-ˌwərm How to pronounce screwworm (audio)
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
2
: a dipteran fly of the genus Chrysomya (C. bezziana) that causes myiasis in Africa and southern Asia

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