Definitions

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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