holocaust Definition in the Cambridge English Dictionary
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holocaustnoun [C]

 us   /ˈhɑl·əˌkɔst, ˈhoʊ·lə-, -ˌkɑst/
a ​largeamount of ​destruction, esp. by ​fire or ​heat, or the ​killing of ​largenumbers of ​people: a ​nuclear holocaustthe Holocaust The Holocaust was the ​systematicmurder of many ​people, esp. ​Jews, by the Nazis during ​World War II.
(Definition of holocaust from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "holocaust" - British English Dictionary

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holocaustnoun [C]

uk   /ˈhɒl.ə.kɔːst/  us   /ˈhɑː.lə.kɑːst/
a very ​largeamount of ​destruction, ​especially by ​fire or ​heat, or the ​killing of very ​largenumbers of ​people: A nuclear holocaust (= ​destructioncaused by ​nuclearweapons) would ​leave few ​survivors.
(Definition of holocaust from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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