from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An isotope of hydrogen with mass number greater than 1; deuterium or tritium.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Another name for deuterium.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)
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