English word onium comes from English ammonia
| Dictionary entry | Language | Definition |
|---|---|---|
| ammonia | English (eng) | (inorganic compound) A gaseous compound of hydrogen and nitrogen, NH3, with a pungent smell and taste. |
| ammonium | English (eng) | (inorganic chemistry) The univalent NH4+ cation, derived by the protonation of ammonia. |
| onium | English (eng) | (chemistry) any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families. (chemistry) any organic derivative of these compounds. |