Romanism

From Roman +‎ -ism, after Romanist.

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Romanism (uncountable)

1. (chiefly derogatory) The tenets of the Church of Rome; the Roman Catholic religion. [from 17th c.]
   • 1790, Hester Thrale Piozzi, Thraliana, 1 August:

     Romanism once extinguished, all other Sects will follow, and that the Catholic Religion—falsely so called—for Catholick means universal—is going, none now will venture to deny.

   • 1967 December 1, Van Til, Cornelius, The Defense of the Faith‎, third edition, Presbyterian and Reformed Pub. Co., page 71:

     It appears then that Warfield himself really suggests a better way of expressing such differences as obtain between Romanism and Protestantism, or between universalistic and particularistic Protestantism than he has himself employed.