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carbon 12

the isotopic carbon atom that comprises 99 percent of naturally occurring carbon, and that since 1961 has been used as the standard for atomic weight by representing a unit of 12.00000.
Also, carbon-12
[kahr-buh n-twelv] /ˈkɑr bənˈtwɛlv/ (Show IPA)
Origin of carbon 12
1940-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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carbon 12 in Science
carbon 12  
A stable isotope of carbon, having six protons and six neutrons in the nucleus. Carbon 12 makes up most naturally occurring carbon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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