Source : Webster's Revised Unabridged Dictionary (1913)

Black friar \Black" fri`ar\ (Eccl.)
   A friar of the Dominican order; -- called also {predicant}
   and {preaching friar}; in France, {Jacobin}. Also, sometimes,
   a Benedictine.

Source : WordNet®

Black Friar
     n : a Roman Catholic friar wearing the black mantle of the
         Dominican order [syn: {Dominican}, {Blackfriar}, {friar
         preacher}]