varioloid Syllabification: (var·i·o·loid)Pronunciation: /ˈve(ə)rēəˌloid/ MedicineDefinition of varioloid adjective resembling smallpox. noun a mild form of smallpox affecting people who have already had the disease or have been vaccinated against it. varioloid in other Oxford dictionaries Definition of varioloid in the British & World English dictionary