1) Inflammatory disease characterized by small lumps or granulomas in lymph nodes and other organs.

2) A chronic disease of unknown cause that is characterized by the formation of nodules resembling true tubercles especially in the lymph nodes, lungs, bones, and skin -- called also Boeck's disease, Boeck's sarcoid, lupus pernio.

3) An inflammatory disease marked by the formation of granulomas (small nodules of immune cells) in the lungs, lymph nodes, and other organs. Sarcoidosis may be acute and go away by itself, or it may be chronic and progressive. Also called sarcoid.