The Collaborative International Dictionary of English v.0.48:

Popish \Pop"ish\, a.
   Of or pertaining to the pope; taught or ordained by the pope;
   hence, of or pertaining to the Roman Catholic Church; --
   often used opprobriously. -- Pop"ish*ly, adv. --
   Pop"ish*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

popish
    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]