The Collaborative International Dictionary of English v.0.48:

Procatarctic \Pro`cat*arc"tic\, a. [Gr. ? beginning beforehand.
   fr. ? to begin first; ? before + ? to begin; ? intens. + ? to
   begin: cf. F. procatarctique. ] (Med.)
   Beginning; predisposing; exciting; initial. [Obs.]
   [1913 Webster]

   Note: The words procatarctic causes have been used with
         different significations. Thus they have been employed
         synonymously with prime causes, exciting causes, and
         predisposing or remote causes.
         [1913 Webster]

               The physician inquires into the procatarctic
               causes.                            --Harvey.
         [1913 Webster]