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rarefy (v.)

late 14c., rarefien, "make thin, reduce the density of," from Old French rarefier (14c.) and directly from Medieval Latin rarificare, from Latin rarefacere "make thin, make rare," from rarus "rare, thin" (see rare (adj.1)) + facere "to make" (from PIE root *dhe- "to set, put"). Intransitive sense of "become less dense" is from 1650s. Related: Rarefied; rarefiable.

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Definitions of rarefy from WordNet

rarefy (v.)
lessen the density or solidity of;
The bones are rarefied
rarefy (v.)
make more subtle or refined;
Synonyms: sublimate / subtilize
rarefy (v.)
weaken the consistency of (a chemical substance);
Synonyms: attenuate
From wordnet.princeton.edu