The Collaborative International Dictionary of English v.0.48:

Maurist \Maur"ist\, n. [From Maurus, the favorite disciple of
   St. Benedict.]
   A member of the Congregation of Saint Maur, an offshoot of
   the Benedictines, originating in France in the early part of
   the seventeenth century. The Maurists have been distinguished
   for their interest in literature.
   [1913 Webster]