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guinea worm

n :  a slender nematode worm of the genus Dracunculus (D. medinensis) attaining a length of several feet, being parasitic as an adult in the subcutaneous tissues of mammals including humans in tropical regions, and having a larva that develops in small freshwater crustaceans (as copepods of the genus Cyclops) and when ingested with drinking water passes through the intestinal wall and tissues to lodge beneath the skin of a mammalian host where it matures - called also Medina worm  .

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