DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Doer \Do"er\, n. [From Do, v. t. & i.]
      1. One who does; one who performs or executes; one who is
         wont and ready to act; an actor; an agent.
         [1913 Webster]
               The doers of the law shall be justified. -- Rom. ii.
                                                     13.
         [1913 Webster]
      2. (Scots Law) An agent or attorney; a factor. --Burrill.
         [1913 Webster]