the stable isotope of carbon having an atomic mass number 13, used as a tracer.
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Also car·bon-13 [kahr-buh n-thur-teen] /ˈkɑr bən θɜrˈtin/.
Origin of carbon 13
First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019