deuterium

[ doo-teer-ee-uh m, dyoo- ]
/ duˈtɪər i əm, dyu- /
|

noun Chemistry.

an isotope of hydrogen, having twice the mass of ordinary hydrogen; heavy hydrogen. Symbol: D; atomic weight: 2.01; atomic number: 1.

Origin of deuterium

1933; < Greek deúter(os) second (see deutero-) + -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for deuterium

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

Word Origin and History for deuterium

deuterium


n.

1933, coined by U.S. chemist Harold C. Urey, with Modern Latin ending + Greek deuterion, neuter of deuterios "having second place," from deuteros "second," from duo (see two). So called because it is twice the mass of hydrogen.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for deuterium

deuterium

[ dōō-tîrē-əm ]

n.

An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of 2.014.heavy hydrogen hydrogen-2
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science 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.