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.

Matador \Mat"a*dor\, n.
   1. [Skat] The jack of clubs, or any other trump held in
      sequence with it, whether by the player or by his
      adversaries.

   2. A certain game of dominoes in which four dominoes (the
      4-3, 5-2, 6-1, and double blank), called matadors, may be
      played at any time in any way.

Source : WordNet®

matador
     n : the principal bullfighter who is appointed to make the final
         passes and kill the bull