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Definition of Helium-4
1. Noun. (isotope) The normal isotope of helium, (nuclide 4 2 He), that has two neutrons ¹
¹ Source: wiktionary.com
Medical Definition of Helium-4
1. The common helium isotope, making up 99.999% of natural helium; it is emitted in the form of alpha rays (which are helium nuclei), from a variety of radionuclides. (05 Mar 2000)
Lexicographical Neighbors of Helium-4
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