Dermatomyositis

Part of speech: noun

Definitions

1. A rare inflammatory disease that causes muscle weakness together with a distinctive rash on the skin, typically around the eyelids and knuckles
2. An uncommon autoimmune condition in which the body's immune system attacks both the muscles and the skin, producing weakness and a characteristic rash
3. A chronic inflammatory disorder affecting the muscles and skin, often marked by progressive weakness and a purplish rash on the face and hands

Etymology: Dermatomyositis is a compound built from two medical building blocks. The first, "dermato-", comes from Greek "derma", meaning skin, and the second, "myositis", is a medical term for inflammation of muscle, itself formed from Greek "mys" (muscle) and the suffix "-itis" for inflammation. Put together, the name describes exactly what the condition does: it inflames both the skin and the muscles beneath it. The word is a modern coinage, not an ancient one. Physicians of the nineteenth and twentieth centuries assembled such terms from classical Greek roots whenever they needed precise names for newly distinguished diseases, so the ancient Greeks had no word for this condition and would have had no way to express it. The formation follows the same pattern as older medical names where a body part is paired with a suffix describing its disorder.