fibrosarcomaPronunciation: /ˌfʌɪbrəʊsɑːˈkəʊmə/Definition of fibrosarcoma noun (plural fibrosarcomas or fibrosarcomata /-mətə/) Medicine a sarcoma in which the predominant cell type is a malignant fibroblast. Derivatives fibrosarcomatous adjective fibrosarcoma in other Oxford dictionaries Definition of fibrosarcoma in the US English dictionary