Source : Webster's Revised Unabridged Dictionary (1913)

Matricide \Mat"ri*cide\, n. [L. matricidium; mater mother +
   coedere to kill, slay: cf. F. matricide. See {Mother}, and
   cf. {Homicide}.]
   1. The murder of a mother by her son or daughter.

   2. [L. matricida: cf. F. matricide.] One who murders one's
      own mother.

Source : WordNet®

matricide
     n 1: a person who murders their mother
     2: murder of your mother