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carbon 13

noun
1.
the stable isotope of carbon having an atomic mass number 13, used as a tracer.
Also, carbon-13
[kahr-buh n-thur-teen] /ˈkɑr bən θɜrˈtin/ (Show IPA)
.
Origin
1940-1945
1940-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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10
13
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