pinworm meaning
Freebase (0.00 / 0 votes) Rate this definition: Pinworm. The pinworm, also known as threadworm or seatworm, is a nematode and a common intestinal parasite, especially in humans. The medical condition associated with pinworm infestation is known as enterobiasis, or less precisely as oxyuriasis in reference to the family Oxyuridae.