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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.
Pronation is the movement of crossing the radius over the ulna. This movement results in the dorsal surface of the hand turning forward, or prone. Supination is the opposite action, wherein the radius is uncrossed and the palmar surface of the hand is returned to the anatomical position, or supine (forward).