The Collaborative International Dictionary of English v.0.48:

Preaching \Preach"ing\ (pr[=e]ch"[i^]ng), n.
   The act of delivering a religious discourse; the art of
   sermonizing; also, a sermon; a public religious discourse;
   serious, earnest advice. --Milner.
   [1913 Webster]

   Preaching cross, a cross, sometimes surmounting a pulpit,
      erected out of doors to designate a preaching place.

   Preaching friars. See Dominican.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dominican \Do*min"i*can\, prop. n. (Eccl. Hist.)
   One of an order of mendicant monks founded by Dominic de
   Guzman, in 1215. A province of the order was established in
   England in 1221. The first foundation in the United States
   was made in 1807. The Master of the Sacred Palace at Rome is
   always a Dominican friar. The Dominicans are called also
   preaching friars, friars preachers, black friars (from
   their black cloak), brothers of St. Mary, and in France,
   Jacobins.
   [1913 Webster]