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Definition of Carbon-12
1. Noun. (isotope) The most abundant of the two stable isotopes of carbon, (nuclide 12 6 C), having six protons and six neutrons; it is the standard for atomic weight and is used to define the mole. ¹
¹ Source: wiktionary.com
Medical Definition of Carbon-12
1. The standard of atomic mass, 98.90% of natural carbon. (05 Mar 2000)