Source : Webster's Revised Unabridged Dictionary (1913)

Rounder \Round"er\, n.
   1. One who rounds; one who comes about frequently or
      regularly.

   2. A tool for making an edge or surface round.

   3. pl. An English game somewhat resembling baseball; also,
      another English game resembling the game of fives, but
      played with a football.

            Now we play rounders, and then we played prisoner's
            base.                                 --Bagehot.

Source : WordNet®

rounder
     n 1: a dissolute person; usually a man who is morally
          unrestrained [syn: {libertine}, {debauchee}]
     2: a tool for rounding corners or edges