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Definition of Oxygen-16
1. Noun. (isotope) The major stable isotope of oxygen, (nuclide 16 8 O), having eight protons and eight neutrons; it amounts to over 99% of the element in nature ¹
¹ Source: wiktionary.com
Medical Definition of Oxygen-16
1. The common oxygen isotope, making up 99.76% of natural oxygen. (05 Mar 2000)