kaposi's sarcoma: a sarcoma that starts with purplish spots on the feet and legs and spreads from the skin to lymph nodes and internal organs; a common manifestation of AIDS
sarcoma: a usually malignant tumor arising from connective tissue (bone or muscle etc.); one of the four major types of cancer
perpetual calendar: a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years