What is the definition or description of: amyotrophy?

Muscle loss: Some muscle shrink (atrophies). It can be painful. It can happen with some nerve diseases. It can also happen in diabetics.

Wasting and weake: Diabetic amyotrophy a painful condition, associated with diabetes, with progressive wasting and weakening of muscles, usually limited to the muscles of the pelvic girdle and thigh. Neuralgic amyotrophy atrophy and paralysis of the muscles of the shoulder girdle, with pain across the shoulder and upper arm.