Urey

Collins
World English Dictionary
Urey (ˈjʊərɪ)
 
n
Harold Clayton. 1893--1981, US chemist, who discovered the heavy isotope of hydrogen, deuterium (1932), and worked on methods of separating uranium isotopes: Nobel prize for chemistry 1934

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American Heritage
Science Dictionary
Urey   (yr'ē)  Pronunciation Key 
American chemist who is best known for his discovery of deuterium (or heavy hydrogen) in 1932, for which he was awarded the 1934 Nobel Prize for chemistry. He also developed theories on the formation of the planets and on the synthesis of elements in the Earth's primitive atmosphere.
The American Heritage® Science Dictionary
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