Толковый словарь английского языка - plutonium
Plutonium
plutonium
noun Etymology: New Latin, from Pluton-, Pluto, the planet Pluto Date: 1942 a radioactive metallic element similar chemically to uranium that is formed as the isotope 239 by decay of neptunium and found in minute quantities in pitchblende, that undergoes slow disintegration with the emission of an alpha particle to form uranium 235, and that is fissionable with slow neutrons to yield atomic energy
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n. Chem. a dense silvery radioactive metallic transuranic element of the actinide series, used in some nuclear reactors and weapons. Usage Symb.: Pu. Etymology: PLUTO (as the next planet beyond Neptune) + -IUM ...Толковый словарь английского языка Oxford English Reference
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