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plutonium

plu·to·ni·um

plutonium

 
pronunciation:
plu to ni m
features:
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part of speech: noun
definition: a radioactive chemical element of the actinide series that has ninety-four protons in each nucleus and that is capable of explosive nuclear fission in a chain reaction, used as fuel in some types of nuclear reactors. (symbol: Pu)
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  element, energy