rhabdomyosarcoma Syllabification: (rhab·do·my·o·sar·co·ma)Pronunciation: /ˌrabdōˌmīōˌsärˈkōmə/Definition of rhabdomyosarcoma noun (plural rhabdomyosarcomas or rhabdomyosarcomata /-ˈkōmətə/) Medicine a rare malignant tumor involving striated muscle tissue. Origin: late 19th century: from Greek rhabdos 'rod' + myo- + sarcomarhabdomyosarcoma in other Oxford dictionaries Definition of rhabdomyosarcoma in the British & World English dictionary