The Collaborative International Dictionary of English v.0.48:

Matador \Mat"a*dor\, Matadore \Mat"a*dore\, 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; a bullfighter; a toreador.
      [1913 Webster +PJC]

   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.
      [1913 Webster]

            When Lady Tricksey played a four,
            You took it with a matadore.          --Swift.
      [1913 Webster]

   3. [Skat] The jack of clubs, or any other trump held in
      sequence with it, whether by the player or by his
      adversaries.
      [Webster 1913 Suppl.]

   4. 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.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

matador
    n 1: the principal bullfighter who is appointed to make the
         final passes and kill the bull

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "matador":
   Cain, apache, assassin, assassinator, banderillero, bloodletter,
   bloodshedder, bravo, burker, butcher, button man, cannibal,
   cutthroat, desperado, eradicator, executioner, exterminator,
   garroter, gorilla, gun, gunman, gunsel, hatchet man, head-hunter,
   hit man, homicidal maniac, homicide, killer, man-eater, man-killer,
   manslayer, massacrer, murderer, pesticide, picador, poison,
   poisoner, slaughterer, slayer, strangler, thug, toreador, torero,
   torpedo, trigger man



U.S. Gazetteer Places (2000):

Matador, TX -- U.S. town in Texas
   Population (2000):    740
   Housing Units (2000): 395
   Land area (2000):     1.299432 sq. miles (3.365513 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.299432 sq. miles (3.365513 sq. km)
   FIPS code:            47004
   Located within:       Texas (TX), FIPS 48
   Location:             34.013996 N, 100.821646 W
   ZIP Codes (1990):     79244
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Matador, TX
    Matador