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isotone's - 1 dictionary results
i·so·tone     (ī'sə-tōn')  Pronunciation Key 
n.   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).]

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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