Source : Webster's Revised Unabridged Dictionary (1913)

Decanal \Dec"a*nal\ (?; 277), a. [Cf. F. d['e]canal. See
   {Dean}.]
   Pertaining to a dean or deanery.

         His rectorial as well as decanal residence. --Churton.

   {Decanal side}, the side of the choir on which the dean's
      tall is placed.

   {Decanal stall}, the stall allotted to the dean in the choir,
      on the right or south side of the chancel. --Shipley.