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plutonium A highly toxic metallic transuranic element. It occurs in trace amounts in uranium ores and is produced in a nuclear reactor by neutron bombardment of uranium-238. The most stable and important isotope, plutonium-239, readily undergoes fission and is used as a reactor fuel in nuclear power stations and in nuclear weapons [plu:'təunɪəm] n
environ.	plutonium
plutonium [plu:'təunɪəm] adj.
econ.	plutonium
English thesaurus
Plutonium [plu:'təunɪəm] abbr.
abbr., scottish	Pu
plutonium [plu:'təunɪəm] adj.
gen.	UPu