To murder is to kill someone.(verb)
Murder is defined as the illegal, pre-planned killing of one person by another, or an unpleasant task or to something that causes pain or discomfort to the body.(noun)
See murder in Webster's New World College Dictionary
Origin: ME murthir, mordre < OE & OFr: OE morthor, akin to ON morth, Goth maurthr; OFr mordre < Frank *morthr: all ult. < IE *mṛtóm < base *mer- > mortal
See murder in American Heritage Dictionary 4
Origin: Middle English murther
Origin: , from Old English morthor; see mer- in Indo-European roots.
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