Rarefiable

rarefy

[rair-uh-fahy]
verb (used with object), rarefied, rarefying.
1.
to make rare or rarer; make less dense: to rarefy a gas.
2.
to make more refined, spiritual, or exalted.
verb (used without object), rarefied, rarefying.
3.
to become rare or less dense; become thinned: Moisture rarefies when heated.

Origin:
1350–1400; Middle English rarefien < Middle French rarefier < Latin rārēfacere, equivalent to rārē-, combining form of rārus rare1 (for expected rāri-; orig. of -ē- unclear) + facere to make; see -fy

rarefiable, adjective
rarefier, noun
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World English Dictionary
rarefy (ˈrɛərɪˌfaɪ)
 
vb , -fies, -fying, -fied
to make or become rarer or less dense; thin out
 
[C14: from Old French raréfier, from Latin rārēfacere, from rārusrare1 + facere to make]
 
'rarefiable
 
adj
 
'rarefier
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

rarefy
late 14c., from O.Fr. rarefier (14c.), from M.L. rarificare, from L. rarefacere "make rare," from rarus "rare, thin" (see rare (1)) + facere "to make" (see factitious).
Online Etymology Dictionary, © 2010 Douglas Harper
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