Definition of ammonium in English:

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Pronunciation: /əˈmōnēəm/


[as modifier] Chemistry
The cation NH4+, present in solutions of ammonia and in salts derived from ammonia.
Example sentences
  • Amides are hydrolysed to ammonium salts with catalysis by acids or alkalis.
  • The perchloric acid then neutralises the alkali ammonia forming crystals of ammonium perchlorate salt.
  • And it contained the inorganic salts manganese sulphate, potassium chloride and ammonium sulphate.


Early 19th century: from ammonia + -ium.

Words that rhyme with ammonium

euphonium, harmonium, pandemonium, pelargonium, plutonium, polonium, zirconium

For editors and proofreaders

Syllabification: am·mo·ni·um

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