The Collaborative International Dictionary of English v.0.48:

Papal \Pa"pal\, a. [F., fr. L. papa bishop. See Papacy.]
   [1913 Webster]
   1. Of or pertaining to the pope of Rome; proceeding from the
      pope; ordered or pronounced by the pope; as, papal
      jurisdiction; a papal edict; the papal benediction.
      --Milman.
      [1913 Webster]

   2. Of or pertaining to the Roman Catholic Church. "Papal
      Christians." --Bp. Burnet.
      [1913 Webster]

   Papal cross. See Illust. 3 of Cross.

   Papal crown, the tiara.
      [1913 Webster]

WordNet (r) 3.0 (2006):

papal cross
    n 1: a cross with three crossbars