The Collaborative International Dictionary of English v.0.48:

Sacerdotal \Sac`er*do"tal\, a. [L. sacerdotalis, fr. sacerdos,
   -otis, a priest, fr. sacer holy, sacred: cf. F. sacerdotal.]
   Of or pertaining to priests, or to the order of priests;
   relating to the priesthood; priesty; as, sacerdotal dignity;
   sacerdotal functions.
   [1913 Webster]

         The ascendency of the sacerdotal order was long the
         ascendency which naturally and properly belongs to
         intellectual superiority.                --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sacerdotal
    adj 1: of or relating to a belief in sacerdotalism; "sacerdotal
           emphasis on the authority of priests"
    2: associated with the priesthood or priests; "priestly (or
       sacerdotal) vestments"; "hieratic gestures" [syn: priestly,
       hieratic, hieratical, sacerdotal]