vermifuge

/ˈvɜrməˌfjudʒ/
noun
  1. A medicine or substance that expels parasitic worms from the body.
    • The vet prescribed a vermifuge to treat the dog's roundworm infection.
    • In some traditional cultures, certain herbs are used as a natural vermifuge.
    • After taking the vermifuge, the patient passed the worms and began to feel better.