The Collaborative International Dictionary of English v.0.48:

Resupination \Re*su`pi*na"tion\, n.
   The state of luing on the back; the state of being
   resupinate, or reversed.
   [1913 Webster]

         Our Vitruvius calleth this affection in the eye a
         resupination of the figure.              --Sir H.
                                                  Wotton.
   [1913 Webster]