| Noun | 1. | rhabdosarcoma - a highly malignant neoplasm derived from striated muscle embryonal rhabdomyosarcoma, embryonal rhabdosarcoma - form of rhabdomyosarcoma occurring mainly in infants and children alveolar rhabdomyosarcoma, alveolar rhabdosarcoma - form of rhabdomyosarcoma occurring mainly in adolescents and young adults pleomorphic rhabdomyosarcoma, pleomorphic rhabdosarcoma - form of rhabdomyosarcoma that affects limb muscles of older adults sarcoma - a usually malignant tumor arising from connective tissue (bone or muscle etc.); one of the four major types of cancer |