rarefaction - WordReference.com Dictionary of English

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- - raptorial
  - rapture
  - rapturous
  - rara avis
  - rare
  - rare bird
  - rare earth
  - rare gas
  - rarebit
  - raree show
  - rarefaction
  - rarefied
  - rarefy
  - rarely
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rarefaction

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Concise Oxford English Dictionary © 2008 Oxford University Press:
rarefaction /ˌrɛːrɪˈfakʃ(ə)n/

▶noun reduction of the density of something, especially air or a gas.

– origin C17: from med. L. rarefactio(n-), from rarefacere ‘grow thin, become rare’.

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