We found 16 dictionaries that define the word anions:

General (10 matching dictionaries)

1. anions: Merriam-Webster
2. anions: Collins English Dictionary
3. anions: Vocabulary.com
4. Anions, anions: Wordnik
5. anions: Cambridge Advanced Learner's Dictionary
6. anions: Wiktionary
7. anions: Dictionary.com
8. Anions: Wikipedia, the Free Encyclopedia
9. anions: FreeDictionary.org
10. Anions: TheFreeDictionary.com

Computing (1 matching dictionary)

11. Anions: Encyclopedia

Medicine (5 matching dictionaries)

12. anions: Merriam-Webster Medical Dictionary
13. Medical Dictionary (No longer online)
14. online medical dictionary (No longer online)
15. Anions: Medical dictionary
16. University of Maryland Glossary of Medical Terms (No longer online)

(Note: See anion as well.)

Definitions from Wiktionary (anion) ▸ noun:  A negatively charged ion. ▸ Also see anion Opposite: cations Adjectives: organic, other, inorganic, complex, radical, various, unmeasured, different, large, monovalent, certain ▸ Words similar to anions ▸ Usage examples for anions ▸ Idioms related to anions ▸ Wikipedia articles (New!) ▸ Popular adjectives describing anions ▸ Words that often appear near anions ▸ Rhymes of anions ▸ Invented words related to anions