We found 24 dictionaries that define the word water softener:

General (18 matching dictionaries)

1. water softener: Longman Dictionary of Contemporary English
2. water softener: Oxford Learner's Dictionaries
3. water softener: American Heritage Dictionary of the English Language
4. water softener: Collins English Dictionary
5. water softener: Vocabulary.com
6. water-softener: Wordnik
7. water softener: Cambridge Advanced Learner's Dictionary
8. water softener: Wiktionary
9. water softener: The Wordsmyth English Dictionary-Thesaurus
10. water softener: Infoplease Dictionary
11. water softener: Dictionary.com
12. Water softener: Wikipedia, the Free Encyclopedia
13. water softener: Rhymezone
14. water softener: FreeDictionary.org
15. water softener: Mnemonic Dictionary
16. water softener: TheFreeDictionary.com

Business (1 matching dictionary)

17. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)

18. water softener: Encyclopedia

Medicine (1 matching dictionary)

19. water softener: Medical dictionary

Science (1 matching dictionary)

20. General Chemistry Online (No longer online)

Tech (2 matching dictionaries)

21. Lake and Water Word Glossary (No longer online)
22. WATER SOFTENER: Power Engineering

(Note: See water_softeners as well.)

Definitions from Wiktionary (water softener) ▸ noun:  A device which reduces the calcium and magnesium concentration of hard water by passing it through an ion exchange resin. Similar: water softening, softener, watermaker, ion exchange, regeneration, water purifier, demineralizer, decalcifier, desalinator, permeator, more... ▸ Words similar to water softener ▸ Usage examples for water softener ▸ Idioms related to water softener ▸ Wikipedia articles (New!) ▸ Words that often appear near water softener ▸ Rhymes of water softener ▸ Invented words related to water softener