The Collaborative International Dictionary of English v.0.48:

Paulist \Paul"ist\, n. (R. C. Ch.)
   A member of The Institute of the Missionary Priests of St.
   Paul the Apostle, founded in 1858 by the Rev. I. T. Hecker of
   New York. The majority of the members were formerly
   Protestants.
   [1913 Webster]