regicide

noun
🔊/ˈredʒɪsaɪd/
🔊/ˈredʒɪsaɪd/
[uncountable, countable] (formal)
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  1. the crime of killing a king or queen; a person who is guilty of this crime弑君罪;弑君者Topics Crime and punishmentc2
    Word Originmid 16th cent.: from Latin rex, reg- ‘king’ + -cide, probably suggested by French régicide.