Etymology
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pinworm (n.)

also pin-worm, "small, thread-like worm," by 1837, from pin (n.) + worm (n.).

updated on October 11, 2020

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Definitions of pinworm from WordNet

pinworm (n.)
small threadlike worm infesting human intestines and rectum especially in children;
Synonyms: threadworm / Enterobius vermicularis
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.