Webster's English Dictionary

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supination

su.pi.na.tion \.su:-p*-'na--sh*n\ n 1: rotation of the forearm and hand or 
   sometimes of other joints (as the sh oulder, hip, or knee) backward and 
   away from the midline of the body 2: the position resulting from supination 
   with the palm of the hand directe d forward and the thumb away from the 
   body