Missionary apostolic

from The Collaborative International Dictionary of English v.0.48

Missionary \Mis"sion*ary\, n.; pl. {Missionaries}. [Cf. F.
   missionnaire. See {Mission}, n.]
   One who is sent on a mission; especially, one sent to
   propagate religion. --Swift.
   [1913 Webster]

   {Missionary apostolic}, a Roman Catholic missionary sent by
      commission from the pope.
      [1913 Webster]