Treacher

from The Collaborative International Dictionary of English v.0.48

Treacher \Treach"er\, n. [OE. trichour, trichur, OF. tricheor
   deceiver, traitor, F. tricheur a cheat at play, a trickster.
   See {Treachery}.]
   A traitor; a cheat. [Obs.]
   [1913 Webster]

         Treacher and coward both.                --Beau. & Fl.
   [1913 Webster]