Enterobius, also known as pinworm, is a type of parasitic worm that infects humans. Synonyms for the word Enterobius include threadworm, seatworm, and oxyurid. Threadworm refers to the thin, thread-like appearance of the parasite, while seatworm is derived from the fact that the pinworms often lay their eggs near the anal area. Oxyurid is the scientific family name for Enterobius, and other members of this family include worm species that also infect animals. While these synonyms may be less commonly used than Enterobius, they can still be helpful in discussing the parasite and its effects on human health.