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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.
Further extension of a joint beyond the zero position is called WHAT. Ex.) if you hold your hand in front of you with your palm down, then raise the back of your hand as if you were admiring a new ring, you WHAT the wrist. WHAT is the movement in the frontal plane back toward the midline.