One of the mysteries of the English language finally explained.
Atypical myotonia; specifically (more fully "congenital paramyotonia", "paramyotonia congenita") a familial (autosomal dominant) disorder characterized by attacks of myotonia typically triggered by exposure to cold, with intermittent flaccid muscle weakness, caused by mutations of the skeletal muscle sodium channel.
Late 19th century; earliest use found in William Richard Gowers (1845–1915), physician. From para- + myo- + -tonia, after German Paramyotonie.
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