IPA: /ˈrɛdʒɪˌsaɪd/
KK: /ˈrɛdʒɪˌsaɪd/
The act of killing a king or a person who kills a king.
The historical event was marked by the regicide that changed the course of the kingdom.
Regicide → It is formed from "rex" (meaning king) and "-cide" (meaning to kill). The word refers to the act of killing a king.
Think of 'rex' for king and '-cide' for killing — that's why regicide means the act of killing a king.