Screw worm

(redirected from screw-worm flies)
Also found in: Medical.
(Zool.) the larva of an American fly (Compsomyia macellaria), allied to the blowflies, which sometimes deposits its eggs in the nostrils, or about wounds, in man and other animals, with fatal results.

See also: Screw

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The two needed a way to get rid of screw-worm flies that would prey on cattle.