parricide

Concise Oxford English Dictionary © 2008 Oxford University Press:
parricide /ˈparɪsʌɪd/

▶noun the killing of a parent or near relative.

■ a person who commits parricide.

– derivatives
parricidal adjective.

– origin C16: from Fr., from L. parricidium, with unknown first elem. assoc. with L. pater ‘father’ and parens ‘parent’.