Onium

Noun

1. (chemistry) any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families
2. (chemistry) any organic derivative of these compounds

Noun

1. (physics) the bound pair of a particle and its antiparticle

Derived terms

• -onium, suffix of onia

Related terms

• positronium
• muononium
• tauonium
• toponium