parricide

noun

Etymology: From Middle French parricide, from Latin parricīdium, of uncertain origin, perhaps from pār (“equal”).

1. The killing of a relative, especially a parent.

   “The new accusation brought by Urban against Manfred of murdering his sister-in-law's embassador – it may be observed that, tacitly, he acquits him of parricide, fratricide, and nepoticide – requires a little explanation.”

   “The production of Schiller’s ‘Don Carlos’ was long forbidden, because Don Carlos loved his stepmother; in ‘The Robbers,’ the Father was turned into an uncle, and a stupendous effect was produced by the cry of “Unclecide,” substituted for Parricide.”

2. The killing of a ruler, or other authority figure; treason.