Definition of pinworm
1 : any of numerous small nematode worms (family Oxyuridae) that infest the intestines and especially the cecum of various vertebrates; especially : a worm (Enterobius vermicularis) parasitic in humans
2 : any of several rather slender insect larvae that burrow in plant tissue
First Known Use of pinworm
Medical 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
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