pinworm

pin·worm

noun \ˈpin-ˌwərm\

Definition of PINWORM

: any of numerous small nematode worms of the family Oxyuridae that have the tail of the female prolonged into a sharp point and infest the intestines and especially the cecum of various vertebrates; especially : a worm of the genus Enterobius (E. vermicularis) that is parasitic in humans