The Collaborative International Dictionary of English v.0.48:
Patricide \Pat*ri"cide\, n. [L. pater father + caedere to kill. Cf. Parricide.] 1. The murderer of his father. [1913 Webster] 2. The crime of one who murders his father. Same as Parricide. [1913 Webster]WordNet (r) 3.0 (2006):
patricide n 1: a person who murders their father 2: the murder of your father