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rarefy Line breaks: rar¦efy
Pronunciation: /ˈrɛːrɪfʌɪ/

Entry from British & World English dictionary

(also rarify)

Definition of rarefy in English:

verb (rarefies, rarefying, rarefied)

Make or become less dense or solid: [with object]: air rarefies and degrounds the physical body [no object]: as the shell continues to expand and rarefy, astronomers may eventually be able to see characteristic gamma rays from the radioactivity within
More example sentences
  • Sound waves propagate through such materials by periodically compressing and rarefying the medium.
  • I know the air is pretty rarified in academia, but has the good professor considered taking an evening course in the university of life?
  • It's one of those rarified treats when you are simply left reaching for words.


Pronunciation: /rɛːrɪfɪˈkeɪʃ(ə)n/
Example sentences
  • It is not just the stress-busting purpose or imparting the feel-good factor, but a rarefication of the body and mind.
Pronunciation: /rɛːrɪˈfaktɪv/
Example sentences
  • The features suggested that the clear cell change resulted from ballooning and rarefactive changes of mitochondria.


Late Middle English: from Old French rarefier, or medieval Latin rareficare, based on Latin rarus 'rare' + facere 'make'.

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