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deuterium

[ doo-teer-ee-uhm, dyoo- ]
/ duˈtɪər i əm, dyu- /
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noun Chemistry.
an isotope of hydrogen, having twice the mass of ordinary hydrogen; heavy hydrogen. Symbols:2H, D; atomic weight: 2.01; atomic number: 1.

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Origin of deuterium

1933; <Greek deúter(os) second (see deutero-) + -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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British Dictionary definitions for deuterium

deuterium
/ (djuːˈtɪərɪəm) /

noun
a stable isotope of hydrogen, occurring in natural hydrogen (156 parts per million) and in heavy water: used as a tracer in chemistry and biology. Symbol: D or ²H; atomic no: 1; atomic wt: 2.014; boiling pt: –249.7°C

Word Origin for deuterium

C20: New Latin; see deutero-, -ium; from the fact that it is the second heaviest hydrogen isotope
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for deuterium

deuterium
[ dōō-tîrē-əm ]

An isotope of hydrogen whose nucleus has one proton and one neutron and whose atomic mass is 2. Deuterium is used widely as a tracer for analyzing chemical reactions, and it combines with oxygen to form heavy water. Also called heavy hydrogen See Note at heavy water.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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