matricide

noun

1. (countable, uncountable)The killing of one's mother.

   “Gerald was imprisoned for matricide: he strangled his mother.”

   “Here the interest was the more compelling because the case of Orestes was unique—not only because matricide was an almost unknown crime, but also because the gods themselves participate in an action in which the slain mother had herself slain the father of her son.”

2. (countable, uncountable)A person who kills his or her mother.

   “Nancy was a matricide; it happened four years ago.”