Early 19th century; earliest use found in Jeremy Bentham (1748–1832), philosopher, jurist, and reformer. From classical Latin populuspeople + -icide, perhaps after French †populicide.
Definition of populicide in US English:
populicide
nounˈpɒpjʊlɪsʌɪd
rare
The systematic killing of a people or nation.
Origin
Early 19th century; earliest use found in Jeremy Bentham (1748–1832), philosopher, jurist, and reformer. From classical Latin populus people + -icide, perhaps after French † populicide.