Webster’s Revised Unabridged Dictionary · 1913
Treacher
Treach′er (trĕch′ẽr), n. [OE. trichour, trichur, OF. tricheor deceiver, traitor, F. tricheur a cheat at play, a trickster. See Treachery.] A traitor; a cheat. [Obs.]
Treacher and coward both. Beau. & Fl.