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deuterium

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deu⋅te⋅ri⋅um

  [doo-teer-ee-uhm, dyoo-]
Use deuterium in a Sentence
–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:
1933; < Gk deúter(os) second (see deutero- ) + -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Moravek Biochemicals
High quality radiochemicals, C14 and tritium custom synthesis
www.moravek.com
Stable Isotopes
Manufacturer of 2900+ deuterated compounds, plus custom synthesis.
www.cdnisotopes.com
deu·te·ri·um   (dōō-tîr'ē-əm, dyōō-)   
n.  An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of 2.014.

[deuter(o)- + -ium.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

deuterium 
1933, coined by U.S. chemist Harold C. Urey, with Mod.L. ending, from Gk. deuterion, neut. of deuterios "having second place."
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: deu·te·ri·um
Pronunciation: d(y)ü-'tir-E-&m
Function: noun
: an isotope of hydrogen that has one proton and oneneutron in its nucleus and that has twice the mass of ordinary hydrogen called also heavy hydrogen
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

deuterium deu·te·ri·um (d&oomacr;-tēr'ē-əm, dy&oomacr;-)
n.
An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of 2.014. Also called heavy hydrogen, hydrogen-2.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
deuterium   (d-tîr'ē-əm)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia

deuterium

isotope of hydrogen with atomic weight of approximately 2. Its nucleus, consisting of one proton and one neutron, has double the mass of the nucleus of ordinary hydrogen. Deuterium is a stable atomic species found in natural hydrogen compounds to the extent of 0.014 to 0.015 percent.

Learn more about deuterium with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Picarro Isotope Analyzers
fast, real-time, in field or lab stable isotope ratio measurements
www.picarro.com/isotopes/
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