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Definition of Hydrogen ion
1. Noun. A positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus.
Medical Definition of Hydrogen ion
1. A hydrogen atom minus its electron and therefore carrying a unit positive charge (i.e., a proton); in water, it combines with a water molecule to form hydronium ion, H3O+. (05 Mar 2000)
Lexicographical Neighbors of Hydrogen Ion
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