To make rare, thin, porous, or less dense / To expand or enlarge without adding any new portion of matter to.

present participle of rarefy

Distant from the lives and everyday concerns of ordinary people; esoteric, exclusive, select. / Elevated in style or nature, sublime; of high intellectual or moral value.

simple past tense and past participle of rarefy

Third-person singular simple present indicative form of rarefy

Capable of being rarefied.

plural of rarefier

One who or that which rarefies.