Usually means: Make less dense or thinner.
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We found 24 dictionaries that define the word rarefy:

General (20 matching dictionaries)
  1. rarefy: Merriam-Webster
  2. rarefy: Oxford Learner's Dictionaries
  3. rarefy: American Heritage Dictionary of the English Language
  4. rarefy: Collins English Dictionary
  5. rarefy: Vocabulary.com
  6. rarefy: Wordnik
  7. rarefy: Wiktionary
  8. rarefy: Webster's New World College Dictionary, 4th Ed.
  9. rarefy: The Wordsmyth English Dictionary-Thesaurus
  10. rarefy: Infoplease Dictionary
  11. rarefy: Dictionary.com
  12. rarefy: Online Etymology Dictionary
  13. Rarefy: Online Plain Text English Dictionary
  14. rarefy: Webster's Revised Unabridged, 1913 Edition
  15. rarefy: Rhymezone
  16. Rarefy: AllWords.com Multi-Lingual Dictionary
  17. rarefy: Webster's 1828 Dictionary
  18. rarefy: FreeDictionary.org
  19. rarefy: Mnemonic Dictionary
  20. rarefy: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. rarefy: Encyclopedia

Medicine (3 matching dictionaries)
  1. rarefy: Merriam-Webster Medical Dictionary
  2. Rarefy: MedFriendly Glossary
  3. online medical dictionary (No longer online)

(Note: See rarefied as well.)

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Definitions from Wiktionary (rarefy)

▸ verb:  (transitive) To make rare, thin, porous, or less dense.
▸ verb:  (intransitive) To become rare, thin or less dense.

Similar:
subtilize, attenuate, sublimate, rarify, subtiliate, rarefact, densitize, thin out, scarcen, sparsen, more...

Opposite:
condense, compress, densify, thicken, concentrate

Colors:
    whisper white,     pale lavender,     airy aqua,     delicate peach,     faint blush, more...
▸ Word origin

▸ Words similar to rarefy

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▸ Wikipedia articles (New!)

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▸ Rhymes of rarefy

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Similar:
subtilize, attenuate, sublimate, rarify, subtiliate, rarefact, densitize, thin out, scarcen, sparsen, more...

Opposite:
condense, compress, densify, thicken, concentrate

Colors:
    whisper white,     pale lavender,     airy aqua,     delicate peach,     faint blush, more...



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