carbon 13

carbon 13

noun
the stable isotope of carbon having an atomic mass number 13, used as a tracer.
Also, car·bon-13 [kahr-buhn-thur-teen] .


Origin:
1940–45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Carbon 13 is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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