from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The sum of the number of neutrons and protons in an atomic nucleus. Also called nucleon number.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The total number of protons and neutrons in an atomic nucleus.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the sum of the number of neutrons and protons in an atomic nucleus
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