Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The sum of the number of neutrons and protons in an atomic nucleus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics The total number of protons and neutrons in an atomic nucleus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the sum of the number of neutrons and protons in an atomic nucleus

Etymologies

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Examples

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