From Wikipedia the free encyclopedia

Oxonium may refer to:

  • Oxonium ion, any ion which contains a tricoordinated oxygen atom, RR'R"O+
  • Oxonium, an IUPAC name for the simplest oxonium ion, hydronium, H3O+
  • Oxonium (often abbreviated to Oxon.), sometimes used in university circles as a Latin name for Oxford University in England