— rarefiable , adj. — rarefier , n.
/rair"euh fuy'/ , v. , rarefied, rarefying .
v.t.
1. to make rare or rarer; make less dense: to rarefy a gas.
2. to make more refined, spiritual, or exalted.
v.i.
3. to become rare or less dense; become thinned: Moisture rarefies when heated.
[ 1350-1400; ME rarefien rarefier rarefacere, equiv. to rare-, comb. form of rarus RARE 1 (for expected rari-; orig. of -e- unclear) + facere to make; see -FY ]