The term "threadworm" refers to a parasitic infection caused by Enterobius vermicularis. This condition is also known as pinworm infection, enterobiasis, or oxyuriasis. Although threadworm is the most commonly used term for this condition, there are other synonyms that people can use to describe the infection. Some of these synonyms include seatworm, buttworm, or anal worm. The infection can cause unpleasant symptoms such as itching around the anus, irritability, and disturbed sleep. It is important to seek medical treatment if you suspect you have a threadworm infection, as it can easily spread to other individuals in your household.