Hair-worm is a term used to describe a type of parasitic worm that infects insects, and it is also known as Nematomorph or Gordian worm. These strange creatures have a long, thin body that resembles a human hair, hence the name. However, scientists have come up with a few other synonyms for hair-worm, including horsehair worm, threadworm, eelworm, and spaghetti worm. These names help to describe the worm's thin, elongated body and its ability to wrap itself around its host like a strand of spaghetti. Despite their bizarre appearance, hair-worms play an important role in the ecosystem by controlling insect populations and serving as food for other animals.