the larva of any of certain flies of the genus Callitroga, which sometimes infests wounds and the nose and navel of domestic animals and humans.

1875–80, Americanism; screw + worm Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
screwworm (ˈskruːˌwɜːm)
1.  the larva of a dipterous fly, Callitroga macellaria, that develops beneath the skin of living mammals often causing illness or death
2.  the fly producing this larva: family Calliphoridae

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Screwworm flies' flesh-eating maggots parasitize livestock, wildlife and humans.
Est-based gene indices for the cattle fever tick, the horn fly, and the screwworm fly.
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