a parasitic nematode worm, Enterobius vermicularis, infecting the colon, rectum, and anus of humans: family Oxyuridae
Also called: threadworm
pinworm in American English
(ˈpɪnˌwɜrm)
noun
any of various parasitic nematode worms, esp. a species (Enterobius vermicularis) often found in the human rectum and large intestine, esp. in children