vermifuge adjective 1noun 1forms 3 adjective1 •(old-fashioned) Acting as a drug to cause the expulsion or death of intestinal worms. noun1 •(old-fashioned) A drug that causes the expulsion or death of intestinal worms, such as tapeworms.[...]; that the fruit is very good eating, either raw or boiled, and that the seeds, distinguished by a mustard-like pungency, are an efficacious vermifuge for children. — 1875 formsvermifuges · more vermifuge · most vermifuge