iodoformPronunciation: /ʌɪˈəʊdə(ʊ)fɔːm, ˈʌɪədə(ʊ)-, ʌɪˈɒdə(ʊ)-/Definition of iodoform noun [mass 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 US English dictionary