car·bon-12 
(kär′bən-twĕlv)
(kär′bən-twĕlv)n.
A stable isotope of carbon, having six protons and six neutrons in the nucleus. Carbon-12 makes up most naturally occurring carbon.
- neofascist
- neoflavone
- Neo-Freudian
- Neogene
- neogenesis
- neogenetic
- neoimpressionism
- neo-impressionism
- neoimpressionist
- Neo-Lamarckian
- Neo-Lamarckism
- neoliberal
- neoliberalism
- neolith
- Neolithic
- neological
- neologically
- neologism
- neologist
- neologistic
- neologistical
- neologize
- neology
- Neo-Malthusian
- Neo-Malthusianism