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Meaning of screwworm

screw•worm

Pronunciation: (skr'wûrm"), [key]
— n.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.