Longman Dictionary of Contemporary English - plutonium
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Plutonium
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1.
Plutonium is a radioactive element used especially in nuclear weapons and as a fuel in nuclear power stations. N-UNCOUNT ...Collins COBUILD Advanced Learner's English Dictionary
2.
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 — see element table ...Merriam-Webster Collegiate Dictionary
3.
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
Большой Англо-русский Русско-английский политехнический словарь
Англо-русский Русско-английский научно-технический словарь
6.
1. хим. плутоний plutonium reactor —- плутониевый реактор; реактор для производства плутония ...Новый большой англо-русский словарь
Англо-русский словарь
8.
- 1942, from Pluto, the planet (discovered 1930 by C.W. Tombaugh, named for L. Pluto, "god of the underworld," from Gk. Plouton "god of wealth"), so called because the element follows neptunium in the periodic table. ...Английский Этимологический словарь
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