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One of two or more atoms whose nuclei have the same number of neutrons but different numbers of protons.
[Alteration of isotope (with n for neutron replacing p as though for proton).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Chemistry) one of two or more atoms of different atomic number that contain the same number of neutrons
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
one of two or more atoms having an equal number of neutrons but different atomic numbers.
[< French (1934), alter. of isotope, by substituting n (the initial letter of neutron) for p (the initial letter of proton)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.