We found 12 dictionaries that define the word ammonium ion:

General (8 matching dictionaries)

1. ammonium ion: Collins English Dictionary
2. ammonium ion: Vocabulary.com
3. ammonium ion: Dictionary.com
4. Ammonium ion: Wikipedia, the Free Encyclopedia
5. ammonium ion: Rhymezone
6. ammonium ion: FreeDictionary.org
7. ammonium ion: Mnemonic Dictionary
8. ammonium ion: TheFreeDictionary.com

Computing (1 matching dictionary)

9. ammonium ion: Encyclopedia

Medicine (2 matching dictionaries)

10. Ammonium ion: MEDLINE plus Illustrated Medical Encyclopedia
11. ammonium ion: Medical dictionary

Tech (1 matching dictionary)

12. Glossary of Meteorology (No longer online)

(Note: See ammonium_ions as well.)

Definitions from WordNet (ammonium ion) ▸ noun:  the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion Opposite: nitrate ion, nitrite ion, nitride ion ▸ Words similar to ammonium ion ▸ Usage examples for ammonium ion ▸ Idioms related to ammonium ion ▸ Wikipedia articles (New!) ▸ Words that often appear near ammonium ion ▸ Rhymes of ammonium ion ▸ Invented words related to ammonium ion