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BNC: 31019 COCA: 24854

deuterium

noun

deu·​te·​ri·​um dü-ˈtir-ē-əm How to pronounce deuterium (audio)
 also  dyü-
: an isotope of hydrogen that has one proton and one neutron in its nucleus and that has twice the mass of ordinary hydrogen
symbol D

called also heavy hydrogen

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