The Collaborative International Dictionary of English v.0.48:

Drover \Dro"ver\, n.
   1. One who drives cattle or sheep to market; one who makes it
      his business to purchase cattle, and drive them to market.
      [1913 Webster]

            Why, that's spoken like an honest drover; so they
            sell bullocks.                        --Shak.
      [1913 Webster]

   2. A boat driven by the tide. [Obs.] --Spenser.
      [1913 Webster]

WordNet (r) 3.0 (2006):

drover
    n 1: someone who drives a herd [syn: herder, herdsman,
         drover]