mur·der·er /ˈmɝdɚ/
  凶手,殺人者,謀害者
  Mur·der·er n.
  1. One guilty of murder; a person who, in possession of his reason, unlawfully kills a human being with premeditated malice.
  2. A small cannon, formerly used for clearing a ship's decks of boarders; -- called also murdering piece. [Obs.]
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  murderer
       n : a criminal who commits homicide (who performs the unlawful
           premeditated killing of another human being) [syn: liquidator,
            manslayer]