Definition of ammonium in English:

ammonium

noun

Chemistry
  • [as modifier] The cation NH₄⁺, present in solutions of ammonia and in salts derived from ammonia.

    • ‘These include things such as urea, ammonia, nitric acid, and ammonium phosphate.’
    • ‘In nickel plating, an electrolytic solution containing nickel ammonium sulfate may be used.’
    • ‘The perchloric acid then neutralises the alkali ammonia forming crystals of ammonium perchlorate salt.’
    • ‘Amides are hydrolysed to ammonium salts with catalysis by acids or alkalis.’
    • ‘And it contained the inorganic salts manganese sulphate, potassium chloride and ammonium sulphate.’

Origin

Early 19th century: from ammonia + -ium.

Pronunciation:

ammonium

/əˈmōnēəm/