0 a very large amount of destruction, especially by fire or heat, or the killing of very large numbers of people: --
1 the killing of millions of Jews and others by the Nazis before and during the Second World War --
2 a large amount of destruction, esp. by fire or heat, or the killing of large numbers of people: --
a nuclear holocaust
Her grandparents were killed during the Holocaust.
He designed the Holocaust Museum in Berlin.