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Definition of regicide noun from the Oxford Advanced Learner's Dictionary

regicide

noun

/ˈredʒɪsaɪd/

/ˈredʒɪsaɪd/

[uncountable, countable] (formal)

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the crime of killing a king or queen; a person who is guilty of this crimeTopics Crime and punishmentc2
Word Originmid 16th cent.: from Latin rex, reg- ‘king’ + -cide, probably suggested by French régicide.

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