teratocarcinomaPronunciation: /ˌtɛrətəʊkɑːsɪˈnəʊmə/Definition of teratocarcinoma noun (plural teratocarcinomata or teratocarcinomas) Medicine a form of malignant teratoma occurring especially in the testis. teratocarcinoma in other Oxford dictionaries Definition of teratocarcinoma in the US English dictionary