1. "person who kills his father" (1593), 2. "act of killing one's father" (1625), from M.Fr. patricide, in both senses, from 1. L. patricida, 2. L. patricidium, from pater "father" + 1. cida "killer," 2. cidium "killing" (see -cide).
patricide
1593, from M.Fr. patricide, 1. "person who kills his father," 2. "act of killing one's father," from 1. L. patricida, 2. L. patricidium, from pater "father" + 1. cida "killer," 2. cidium "killing."