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isotopy

[ahy-sot-uh-pee, ahy-suh-toh-pee] /aɪˈsɒt ə pi, ˈaɪ səˌtoʊ pi/
noun, Chemistry
1.
the quality or condition of being isotopic; isotopic character.
Origin
1915-1920
1915-20; isotope + -y3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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