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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.
2 (of the arm) the rotation of the forearm so that the palm of the hand faces downward or backward. 3 (of the foot) the lowering of the medial edge of the foot by turning it outward and through abduction in the tarsal and metatarsal joints. pronate, v.