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Any of about 250–300 species (class Nematomorpha, or Gordiacea; phylum Aschelminthes) of long, thin worms. The young are parasites in arthropods; the adults are free-living in the sea or in freshwater. The hairlike body sometimes grows to a length of about 39 in. (1 m).
Variants of HORSEHAIR WORM
horsehair worm or hairworm or gordian worm
This entry comes from Encyclopædia Britannica Concise. For the full entry on horsehair worm, visit Britannica.com.