What is the meaning of myotonia atrophica?

noun

• A severe form of muscular dystrophy marked by generalized weakness and muscular wasting that affects the face and feet and hands and neck; difficult speech and difficulty with the hands that spreads to the arms and shoulders and legs and hips; the onset can be any time from birth to middle age and the progression is slow; inheritance is autosomal dominant.
  • synonyms: myotonic muscular dystrophy, myotonic dystrophy, Steinert's disease