REGICIDE

regicide

(noun) the act of killing a king

regicide

(noun) someone who commits regicide; the killer of a king

Source: WordNet® 3.1

Etymology

Noun

regicide (plural regicides)

The killing of a king.

One who kills a king. [from 1540s]

Synonym: kingslayer

Source: Wiktionary

Reg"i*cide (rj"*sd), n. Etym: [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.

Source: Webster’s Unabridged Dictionary 1913 Edition