from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon 12, which is assigned a mass of 12. Also called dalton.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. unit of mass for expressing masses of atoms or molecules
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