supination Meaning, Definition & Usage

  1. noun rotation of the hands and forearms so that the palms face upward

WordNet

Su`pi*na"tion noun
Etymology
L. supinare, supinatum, to bend or lay backward, fr. supinus supine: cf. F. supination. See Supine.
Definitions
  1. (Physiol.) (a) The act of turning the hand palm upward; also, position of the hand with the palm upward. (b) The act or state of lying with the face upward. Opposed to pronation.

Webster 1913