holocaust
From Longman Dictionary of Contemporary Englishholocausthol‧o‧caust /ˈhɒləkɔːst $ ˈhɑːləkɒːst/ noun [countable] 1 DISASTERa situation in which there is great destruction and a lot of people die a nuclear holocaust2 → the HolocaustOrigin holocaust (1200-1300) Old French holocauste, from Greek holokaustos “burnt whole”, from holos “whole” + kaiein “to burn”