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
hairworm
noun(hair-worm)
any of a genus (Capillaria) of nematode worms that include serious parasites of the digestive tract of fowls and tissue and organ parasites of mammals