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myotonia congenita

(kən-jĕnĭ-tə)
n.
  1. A hereditary disease characterized by tonic spasm or temporary rigidity of certain muscles after an attempt has been made to move them.Thomsen's disease
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.