| n. | 1. | (Zool.) A small nematoid worm (Oxyurus vermicularis), which is parasitic chiefly in the rectum of man. It is most common in children and aged persons. |
| Noun | 1. | pinworm - small threadlike worm infesting human intestines and rectum especially in childrenSynonyms: Enterobius vermicularis, threadworm |
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