rarefy

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Related to rarifies: rarefy

rar·e·fy

(rār'ĕ-fī),
To become light or less dense.
Farlex Partner Medical Dictionary © Farlex 2012

rarefy

(rār′ĕ-fī)
To make less dense; to increase the porosity of something.
Medical Dictionary, © 2009 Farlex and Partners