'Papist' definitions:

Definition of 'papist'

adjective

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

noun

An offensive term for Roman Catholics; originally, a Roman Catholic who was a strong advocate of the papacy

From: GCIDE

Papist \Pa"pist\, n. [F. papiste. See Pape, Pope.] A Roman Catholic; one who adheres to the Church of Rome and the authority of the pope; -- an offensive designation applied to Roman Catholics by their opponents. [1913 Webster] Papistic