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Definition of Nitrogen-14
1. Noun. (isotope) The major stable isotope of nitrogen, (nuclide 14 7 N), having seven protons and seven neutrons; it accounts for well over 99% of the natural element. ¹
¹ Source: wiktionary.com
Medical Definition of Nitrogen-14
1. The common nitrogen isotope, making up 99.63% of natural nitrogen. (05 Mar 2000)