Is it ensure, insure, or assure?
anthelmintic ant·hel·min·tic (ānt'hěl-mĭn'tĭk, ān'thěl-) or ant·hel·min·thic (-thĭk)
An agent that destroys or causes the expulsion of parasitic intestinal worms. Also called helminthagogue, helminthic, vermifuge. adj.
Acting to expel or destroy parasitic intestinal worms.
any drug that acts against helminthic infections, i.e., those caused by parasitic worms. The term vermifuge is often applied to remedies used to remove intestinal worms; only rarely do the agents directly kill the parasites. No anthelmintic is completely effective, completely without toxic effect upon the host, or equally active against all worms.