From The Collaborative International Dictionary of English v.0.48:
Barker \Bark"er\, n. 1. An animal that barks; hence, any one who clamors unreasonably. [1913 Webster]
2. One who stands at the doors of shops to urg? passers by to make purchases. [Cant, Eng.] [1913 Webster]
3. A pistol. [Slang] --Dickens. [1913 Webster]
4. (Zool.) The spotted redshank. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Barker \Bark"er\, n. One who strips trees of their bark. [1913 Webster]