Source : Webster's Revised Unabridged Dictionary (1913)

Catcher \Catch"er\, n.
   1. One who, or that which, catches.

   2. (Baseball) The player who stands behind the batsman to
      catch the ball.

Source : WordNet®

catcher
     n 1: (baseball) the person who plays the position of catcher
     2: the position on a baseball team of the player who is
        stationed behind home plate and who catches the balls that
        the pitcher throws; "a catcher needs a lot of protective
        equipment"; "he plays behind the plate" [syn: {plate}]