Sarcoma

n. (Medicine) malignant tumor in supportive tissues (such as the bones, fat, muscle, or cartilage)

A sarcoma is a cancer of the connective or supportive tissue (bone, cartilage, fat, muscle, blood vessels) and soft tissue. This is in contrast to carcinomas, which are of epithelial origin(breast, colon, pancreas, and others).
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Sarcoma /sar·co·ma/ pl. sarcomas, sarco´mata any of a group of tumors usually arising from connective tissue, although the term now includes some [more]Sarcoma - Community and Resources

Noun
1. a usually malignant tumor arising from connective tissue (bone or muscle etc.); one of the four major types of cancer
(hypernym) cancer, malignant neoplastic disease
(hyponym) chondrosarcoma

n. sarcoma, (Medicine) malignant tumor in supportive tissues