The Collaborative International Dictionary of English v.0.48:

Payndemain \Payn`de*main"\, n. [OF. pain bread + demaine
   manorial, lordly, own, private. See Payn, and Demesne.
   Said to be so called from the figure of our Lord impressed
   upon it.]
   The finest and whitest bread made in the Middle Ages; --
   called also paynemain, payman. [Obs.]
   [1913 Webster]