Regicide
Defined in 4 dictionaries — Ballentine's (1916), Black's (1910), Anderson (1889), Abbott (1879)
Ballentine's Law Dictionary
James A. Ballentine · 1916
One who killed a king or queen; the act of so doing.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The murder of a sovereign; also the person who commits such murder.
A Dictionary of Law
William C. Anderson · 1889
See Homicide.
Dictionary of Terms and Phrases Used in American or English Jurisprudence
Benjamin Vaughan Abbott · 1879
A slayer of a king; also, the killing of a king.