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Amoss' sign

məs)
n.
  1. An indication of painful flexion of the spine in which it is necessary to support a sitting position by extending the arms behind the torso and placing its weight on the hands.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.