ivermectin UK /ˌʌɪ.vəˈmɛk.tɪn/US /ˌaɪ.vɚˈmɛk.tɪn/ noun1 •A compound of the avermectin group, used as an anthelmintic in veterinary medicine and as a treatment for river blindness.Dr. Yu has refused the ivermectin requests, he said, but he knows some of his colleagues have not. — 2021 formsivermectins