Regicide
Pronunciation : Reg"i*cide (rj"*sd)
Part of Speech : n.
Etymology : [F. r?gicide; L. rex, regis, a king + caedere to kill. Cf. Homicide.]
Definition : 1. One who kills or who murders a king; specifically (Eng.Hist.), one of the judges who condemned Charles I. to death.
2. The killing or the murder of a king.
Source : Webster's Unabridged Dictionary, 1913