Noun | 1. | ![]() malignant neoplasm, malignant tumor, metastatic tumor - a tumor that is malignant and tends to spread to other parts of the body lymphoma - a neoplasm of lymph tissue that is usually malignant; one of the four major types of cancer cancer of the blood, leucaemia, leukaemia, leukemia - malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer sarcoma - a usually malignant tumor arising from connective tissue (bone or muscle etc.); one of the four major types of cancer |