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Verb: rarefy  'reh-ru,fI
  1. Lessen the density or solidity of
    "The bones are rarefied";
    - rarify
     
  2. Make more subtle or refined
    - sublimate, subtilize, rarify, subtilise [Brit]
     
  3. (chemistry) weaken the consistency of (a chemical substance)
    - attenuate, rarify

Derived forms: rarefies, rarefied, rarefying

Type of: alter, change, modify, weaken

Encyclopedia: Rarefy