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babinski's sign in Medicine

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.