regicidal

/ˌrɛdʒɪˈsaɪdəl/
adjective
  1. Relating to or involved in the killing of a king or queen.
    • The play explores the regicidal ambitions of a power-hungry noble.
    • The regicidal plot was discovered before it could be carried out.
    • Historians still debate the regicidal motives of the revolutionaries.
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