Definition of hairworm
1 : any of a phylum (Nematomorpha) of elongated worms that have separate sexes, are parasitic in arthropods as larvae, and are free-living in water as adults —called also horsehair worm
2 : any of a genus (Capillaria) of nematode worms that include serious parasites of the alimentary tract of fowls and tissue and organ parasites of mammals
First Known Use of hairworm
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