Hypertext Webster Gateway: "pinworm"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pinworm \Pin"worm`\, n. (Zo["o]l.)
A small nematoid worm ({Oxyurus vermicularis}), which is
parasitic chiefly in the rectum of man. It is most common in
children and aged persons.
From WordNet (r) 1.7 (wn)
pinworm
n : small threadlike worm infesting human intestines and rectum
especially in children [syn: {threadworm}, {Enterobius
vermicularis}]
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