What do a.m. and p.m. stand for?

heavy hydrogen

either of the heavy isotopes of hydrogen, especially deuterium.
Origin of heavy hydrogen
1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for heavy hydrogen
  • 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.
British Dictionary definitions for heavy hydrogen

heavy hydrogen

another name for deuterium
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
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heavy hydrogen in Medicine

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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heavy hydrogen in Science
heavy hydrogen  
See deuterium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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