That kills a king or kings; regicidal.
1598. Sylvester, Du Bartas, II. ii. II. Babylon, 4. King-killing Treacheries Succeed a-row, with Wrack of Israel.
a. 1732. Atterbury, Serm. (1737), IV. 21. They outstripped … even the bloodiest of their king-killing neighbours.
