ˌsüpəˈnāshən noun
( -s )
Etymology: Latin supinat us (past participle of supinare to lay backward or on the back, from supinus supine) + English -ion
1. : a rotation of the hand and radius around the ulna so that the palm is turned up ; also : the position resulting from this movement — opposed to pronation
2. : a corresponding movement of the foot and leg