Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Language: Modern Latin
Origin: Pluto

plutonium

 noun
     
Related topics: Elements
plu‧to‧ni‧um [uncountable]
HCE a radioactive metal that is used in the production of nuclear power, and in nuclear weapons. It is a chemical element: symbol Pu
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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