noun
racial genocide; ethnic genocide
A formal compound referring to the deliberate and systematic destruction of a racial or ethnic group. Often used in historical, legal, or political contexts.
国際法廷はその行為を民族大虐殺と認定した。
The international tribunal recognized the act as racial genocide.
歴史学者は20世紀の民族大虐殺について研究している。
Historians are researching the racial genocides of the 20th century.
大量虐殺 means 'mass slaughter' or 'massacre' and does not necessarily imply a racial or ethnic motive, whereas 民族大虐殺 specifically targets a racial or ethnic group.
ジェノサイド is a loanword from English 'genocide' and is used in similar contexts, but 民族大虐殺 is a native Japanese compound that explicitly includes the element of 'race/ethnicity' (民族).
Compound of 民族 (みんぞく, 'race, ethnic group') + 大 (だい, 'great, large-scale') + 虐殺 (ぎゃくさつ, 'slaughter, massacre'). The term is a modern formation, likely influenced by international legal and historical discourse on genocide.