The Collaborative International Dictionary of English v.0.48:

Predicant \Pred"i*cant\, a. [L. praedicans, -antis, p. pr. of
   praedicare. See Predicate.]
   Predicating; affirming; declaring; proclaiming; hence;
   preaching. "The Roman predicant orders." --N. Brit. Rev.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Predicant \Pred"i*cant\, n.
   One who predicates, affirms, or proclaims; specifically, a
   preaching friar; a Dominican.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Blackfriar \Black"fri`ar\, Black friar \Black"
fri`ar\(bl[a^]k"fr[imac]`[~e]r). (Eccl.)
   A friar of the Dominican order, so named because wearing the
   black mantle of the Dominicans; -- called also predicant
   and preaching friar; in France, Jacobin. Also, sometimes,
   a Benedictine.

   Syn: Dominican.
        [1913 Webster]