from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry A unit of mass equal to 1/12 the mass of an atom of the 12C
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun unit of mass for expressing masses of atoms or molecules
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