The Collaborative International Dictionary of English v.0.48:

Papistic \Pa*pis"tic\, Papistical \Pa*pis"tic*al\, a. [Cf. F.
   papistique.]
   Of or pertaining to the Church of Rome and its doctrines and
   ceremonies; pertaining to popery; popish; -- used
   disparagingly. "The old papistic worship." --T. Warton. --
   Pa*pis"tic*al*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

papistic
    adj 1: of or relating to or supporting Romanism; "the Roman
           Catholic Church" [syn: Roman, R.C., Romanist,
           romish, Roman Catholic, popish, papist,
           papistic, papistical]