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/suÂ·piÂ·naÂ·tion/ (sooâ³pÄ­-naÂ´shun) [L. supinatio ] the act of assuming the supine position, or the state of being supine. Applied to the hand, the act of turning the palm forward (anteriorly) or upward, performed by lateral rotation of the forearm. Applied to the foot, it generally implies movements resulting in raising of the medial margin of the foot, hence of the longitudinal arch.
/proÂ·naÂ·tion/ (-naÂ´shun) the act of assuming the prone position, or the state of being prone. Applied to the hand, the act of turning the palm backward (posteriorly) or downward, performed by medial rotation of the forearm.