Reg″i‐cide (rĕj″ĭ‐sīd), n. [F. régicide; 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.