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Definition of plutonium noun from the Oxford Advanced Learner's Dictionary

 

plutonium

 noun
noun
BrE BrE//pluːˈtəʊniəm//
 
; NAmE NAmE//pluːˈtoʊniəm//
 
[uncountable] (symbol Pu)
 
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a chemical element. Plutonium is radioactive and is used in nuclear weapons and in producing nuclear energy. Word Origin 1940s: from Greek ‘Pluto’, on the pattern of neptunium, being the next planet beyond Neptune.Extra examples one ton of plutonium extracted from spent nuclear fuel the capability to enrich uranium or reprocess plutonium the plane that dropped a plutonium bomb on the city of Nagasaki
See the Oxford Advanced American Dictionary entry: plutonium