\Reg"i*cide\ (r?j"?*s?d), n. [F. r['e]gicide; L. rex,
regis, a king + caedere to kill. Cf. {Homicide}.]
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.