pin·worm   (pĭn'wûrm')    n.  Any of various small nematode worms of the family Oxyuridae that are parasitic on horses, rabbits, and other mammals, especially Enterobius vermicularis, a species that infests the human intestines and rectum. Also called threadworm.

Main Entry: pin·worm
Pronunciation: 'pin-"w&rm
Function: noun
: any of numerous small nematode worms of the family Oxyuridae that have the tail ofthe 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

pinworm pin·worm (pĭn'wûrm')
n.
Any of various small nematode worms of the family Oxyuridae that are parasitic on mammals, especially Enterobius vermicularis, a species that infests the human intestines and rectum. Also called seatworm, threadworm.