'Threadworm' definitions:

Definition of 'threadworm'

noun

Small threadlike worm infesting human intestines and rectum especially in children [syn: pinworm, threadworm, Enterobius vermicularis]

From: GCIDE

Threadworm \Thread"worm`\, n. (Zool.) Any long, slender nematode worm, especially the pinworm and filaria. [1913 Webster]