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stiff-man syndrome

(stĭfmăn′)
n.
  1. A chronic, progressive but variable disorder of the central nervous system having no known cause and associated with fluctuating muscle spasms and stiffness.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.