Longman Dictionary of Contemporary English homepage

weapons of mass destruction

 noun
     
weapons of mass destruction [plural]
chemical, nuclear, or biological weapons that are very powerful and could kill a lot of people or destroy large areas. This expression is used especially by politicians and news reporters to talk about weapons that are held by countries which are considered to be a threat to world peace.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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