heavy hydrogen

noun
1.
either of the heavy isotopes of hydrogen, especially deuterium.

Origin:
1930–35

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Collins
World English Dictionary
heavy hydrogen
 
n
another name for deuterium

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

heavy hydrogen n.
See deuterium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
heavy hydrogen  
See deuterium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

heavy hydrogen

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Caging heavy hydrogen molecules is even more interesting.
Then a normal and heavy hydrogen combine into a light helium.
Cold fusion using fullerene to squeeze heavy hydrogen is one method.
The more heavy hydrogen you have, the warmer the cloud was that had the snow.
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