iodoform Syllabification: (i·o·do·form)Pronunciation: /īˈōdəˌfôrm, īˈädə-/Definition of iodoform noun a volatile pale yellow sweet-smelling crystalline organic compound of iodine, with antiseptic properties. Alternative name: triiodomethane; chemical formula: CHI3 Origin: mid 19th century: from iodine, on the pattern of chloroformiodoform in other Oxford dictionaries Definition of iodoform in the British & World English dictionary