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The Collaborative International Dictionary of English v.0.48 (gcide)

Rarefy \Rar"e*fy\ (r[a^]r"[-e]*f[imac]; 277), v. t. [imp. & p.
p. {Rarefied} (r[a^]r"[-e]*f[imac]d); p. pr. & vb. n.
{Rarefying} (r[a^]r"[-e]*f[imac]`[i^]ng).] [F. rar['e]fier;
L. rarus rare -ficare (in comp.) to make; cf. L.
rarefacere. See {-fy}.]
To make rare, thin, porous, or less dense; to expand or
enlarge without adding any new portion of matter to; --
opposed to condense.
[1913 Webster]


Rarefy \Rar"e*fy\, v. i.
To become less dense; to become thin and porous. "Earth
rarefies to dew." --Dryden.
[1913 Webster]