Wormers are medications used to eliminate parasites in animals. There are several synonyms for wormer, including dewormer, anthelmintic, antiparasitic, antifilarial, and vermifuge. Dewormer is the most commonly used synonym and is used to describe the process of getting rid of intestinal parasites in livestock animals such as horses, cows, and sheep. Anthelmintic is a broad term that describes any medication used to treat internal parasites. Antiparasitic is used to describe treatments that target both internal and external parasites, such as fleas, ticks, and lice. Antifilarial refers specifically to medications designed to eliminate filarial worms, which are responsible for conditions such as elephantiasis in humans. Vermifuge is another term used to describe dewormers that remove parasites from the body.