D defs.my
Entry 2 senses Webster, 1913

Murderer

/(mûr"dẽr*ẽr)/ · Mur·der·er · IPA /ˈmɝdɚɚ/
01 n. One guilty of murder; a person who, in possession of his reason, unlawfully kills a human being with premeditated malice.
  1. 1.
    One guilty of murder; a person who, in possession of his reason, unlawfully kills a human being with premeditated malice.
  2. 2.
    A small cannon, formerly used for clearing a ship's decks of boarders; -- called also murdering piece.[Obs.] Also: murdering piece