We found 27 dictionaries that define the word rarefaction:

General (18 matching dictionaries)

1. rarefaction: Merriam-Webster
2. rarefaction: Oxford Learner's Dictionaries
3. rarefaction: American Heritage Dictionary of the English Language
4. rarefaction: Collins English Dictionary
5. rarefaction: Vocabulary.com
6. rarefaction: Wordnik
7. rarefaction: Wiktionary
8. rarefaction: Infoplease Dictionary
9. rarefaction: Dictionary.com
10. Rarefaction (ecology), Rarefaction: Wikipedia, the Free Encyclopedia
11. Rarefaction: Online Plain Text English Dictionary
12. rarefaction: Webster's Revised Unabridged, 1913 Edition
13. rarefaction: Rhymezone
14. Rarefaction: AllWords.com Multi-Lingual Dictionary
15. rarefaction: Webster's 1828 Dictionary
16. rarefaction: FreeDictionary.org
17. rarefaction: Mnemonic Dictionary
18. rarefaction: TheFreeDictionary.com

Computing (1 matching dictionary)

19. rarefaction: Encyclopedia

Medicine (5 matching dictionaries)

20. rarefaction: Merriam-Webster Medical Dictionary
21. Dorland's Illustrated Medical Dictionary (No longer online)
22. online medical dictionary (No longer online)
23. National MCH Center for Child Death Review (No longer online)
24. rarefaction: Medical dictionary

Tech (3 matching dictionaries)

25. Schlumberger Oilfield Glossary (No longer online)
26. Rane Professional Audio Reference (No longer online)
27. Sweetwater Music (No longer online)

(Note: See rarefactional as well.)

Definitions from Wiktionary (rarefaction) ▸ noun:  A reduction in the density of a material, especially that of a fluid. Similar: arefaction, vacuum, haze, defluidization, fractionation, concentration, throttling, attenuation, cooling, reducer, more... Opposite: compression, condensation, densification Phrases: rarefaction wave, bone rarefaction, more... Adjectives: periapical, generalized, diffuse, extreme, great, skeletal, sudden, general, maximum, slight, apical ▸ Words similar to rarefaction ▸ Usage examples for rarefaction ▸ Idioms related to rarefaction ▸ Wikipedia articles (New!) ▸ Popular adjectives describing rarefaction ▸ Words that often appear near rarefaction ▸ Rhymes of rarefaction ▸ Invented words related to rarefaction