Definitions

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

  • noun One of two or more atoms whose nuclei have the same number of neutrons but different numbers of protons.

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

  • noun physics either of a number of nuclides of different elements that have the same number of neutrons

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Alteration of isotope (with n for neutron replacing p as though for proton).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Reinterpretation of the p in isotope to stand for proton, leading to a replacement of the letter n for neutron.

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