myotonia congenita
/mʌɪə(ʊ)ˌtəʊnɪə kənˈdʒɛnɪtə/Medicine
noun
A rare hereditary disease manifesting soon after birth and characterized by myotonia but without muscular wasting or other symptoms. Also called Thomsen's disease.
Origin
Late 19th century; earliest use found in Journal of Nervous and Mental Disease. From scientific Latin myotonia congenita from myotonia + congenita, feminine of congenitus congenital.