Source : Webster's Revised Unabridged Dictionary (1913)

Matadore \Mat"a*dore\, Matador \Mat"a*dor\, n. [Sp. matador,
   prop., a killer, fr. matar to kill, L. mactare to sacrifice,
   kill.]
   1. The killer; the man appointed to kill the bull in
      bullfights.

   2. (Card Playing) In the game of quadrille or omber, the
      three principal trumps, the ace of spades being the first,
      the ace of clubs the third, and the second being the deuce
      of a black trump or the seven of a red one.

            When Lady Tricksey played a four, You took it with a
            matadore.                             --Swift.