ho·lo·caust 
/ˈhoʊləˌkɑ:st, ˈhɑ:ləˌkɑ:st/ noun
plural ho·lo·causts /ˈhoʊləˌkɑ:st, ˈhɑ:ləˌkɑ:st/ noun formal 1 the Holocaust : the killing of millions of Jews and other people by the Nazis during World War II
▪ The museum is devoted to the Holocaust. ▪ Her parents were survivors of the Holocaust. = Her parents were Holocaust survivors. ▪ a Holocaust memorial 2 [count] : an event or situation in which many people are killed and many things are destroyed especially by fire
▪ There were fears of a nuclear holocaust.
▪ The museum is devoted to the Holocaust. ▪ Her parents were survivors of the Holocaust. = Her parents were Holocaust survivors. ▪ a Holocaust memorial
▪ There were fears of a nuclear holocaust.
