patricide (n.) Look up patricide at Dictionary.com
1. "person who kills his father" (1590s), 2. "act of killing one's father" (1620s), from Middle French patricide in both senses, from 1. Latin patricida "murderer of a father," 2. Latin patricidium, from pater "father" + 1. cida "killer," 2. cidium "killing" (both from PIE root *kae-id- "to strike").