pinworm

Any of various small nematode worms of the order Oxyurida that are parasitic in vertebrates and certain invertebrates, especially Enterobius vermicularis, a species that infests the human intestines.

A small threadworm or nematoid, Oxyuris vermicularis, infesting the rectum, especially of children. See Ascaridæ, and cut under Oxyuris.

A small nematoid worm (Oxyurus vermicularis), which is parasitic chiefly in the rectum of man. It is most common in children and aged persons.

Any of several nematode worms, of the family Oxyuridae, that are parasitic to mammals

small threadlike worm infesting human intestines and rectum especially in children