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 differentelements that have the same number ofneutrons
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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