ˌweapons of ˌmass deˈstruction noun [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. 大规模杀伤性武器〔此说法尤为政治人物和新闻记者使用〕