parenticide1
/pəˈrɛntɪsʌɪd/rare
noun
A person who murders one or both of his or her parents (or, in early use, any relative).
Origin
Mid 17th century; earliest use found in Thomas Blount (1618–1679), antiquary and lexicographer. From parent + -icide, probably in quot. 1656 after classical Latin parenticīda (in an isolated attestation in Plautus).
parenticide2
/pəˈrɛntɪsʌɪd/rare before 20th cent
noun
The murder of a parent.
Origin
Mid 17th century; earliest use found in Edward Phillips (b. 1630), writer and biographer. From parent + -icide. Compare post-classical Latin parenticidium.