sarcoma Definition

a malignant tumor arising in tissue (such as connective tissue, bone, cartilage, or striated muscle) of mesodermal origin

a malignant bone tumor especially of a long bone (as of the thigh) or the pelvis

a neoplastic disease that occurs especially in individuals coinfected with HIV and a specific herpesvirus (species Human herpesvirus 8 of the genus Rhadinovirus), that affects especially the skin and mucous membranes, and that is marked usually by pink to reddish-brown or bluish plaques, macules, papules, or nodules especially on the lower extremities —abbreviation KS

osteosarcoma

a sarcoma of chickens caused by a retrovirus (species Rous sarcoma virus of the genus Alpharetrovirus)