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Barré's sign

(bă-rāz)
n.
  1. An indication of disease of the corticospinal tracts in which an individual, when placed in a prone position with the legs flexed at the knees, is unable to maintain a flexed position on the side of the lesion but can extend the leg.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.