from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of several isotopic forms of water, especially deuterium oxide, that consists chiefly of molecules containing heavy hydrogen and is used as a moderator in certain nuclear reactors.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Water containing deuterium instead of normal hydrogen (symbol D2O); used as a moderator in nuclear reactors.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. water containing a substantial proportion of deuterium atoms, used in nuclear reactors


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