regicide

regicide · noun¹

1. Medieval Latin · learned borrowing fromrēgicidium“king-killing”
2. English todayregicide

Learned borrowing from Medieval Latin rēgicidium (“king-killing”)

regicide · noun²

1. Medieval Latin · learned borrowing fromrēgicida“king-killer”
2. English todayregicide

Learned borrowing from Medieval Latin rēgicida (“king-killer”).

First known use, by meaning

• from 1540s One who kills a king.