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regicide (n.)

1540s, "a king-killer, man who kills a king," formed from Latin rex (genitive regis) "king" (see regal) + -cide. Meaning "the killing of a king, crime of killing a king" is from c. 1600.

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Definitions of regicide from WordNet

regicide (n.)
someone who commits regicide; the killer of a king;
regicide (n.)
the act of killing a king;
From wordnet.princeton.edu