WordWeb Online

1. Make more complex, intricate, or rich
   "rarify a design or pattern";
   - complicate, refine, elaborate, rarefy
    
2. (chemistry) weaken the consistency of (a chemical substance)
   - rarefy, attenuate
    
3. Lessen the density or solidity of
   - rarefy
    
4. Make more subtle or refined
   - rarefy, sublimate, subtilize, subtilise [Brit]

Derived forms: rarifying, rarified, rarifies

Type of: alter, change, modify, weaken

Encyclopedia: Rarify