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The Collaborative International Dictionary
Papistically

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.

Wiktionary
papistically

adv. In a papistical manner; by, or with reference to, a pope.