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Babinski's sign

n.
  1. Babinski's reflex
  2. Weakness of the platysma muscle on the affected side in hemiplegia, evident in such actions as blowing or opening the mouth.
  3. A sign of hemiplegia in which the thigh on the paralyzed side flexes and the heel is raised when a person attempts to sit up while lying supine with legs extended and arms crossed upon the chest.
  4. A sign of hemiplegia in which the forearm on the affected side, when placed in a position of supination, turns into the pronated position.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.