Definition of hydrogen ion:
(n) :
(chemistry) Used other than figuratively or idiomatically: see hydrogen, ion.: H⁻ or H⁺
(n) :
(chemistry) a proton combined with one or more water molecules; usually written H₃O⁺ and called the hydronium ion though is best considered as H₉O₄⁺ but is often written H⁺_((aq)) for simplicity
(n) :
(chemistry) a bare hydrogen nucleus; a proton, deuteron or triton