raréfier

== French == === Etymology === Borrowed from Latin rarefacere. By surface analysis, rare +‎ -fier. === Pronunciation === === Verb === raréfier (transitive) to rarefy, make rarer (reflexive) become thinner on the ground, become less and further between, become scarce ==== Conjugation ==== ==== Related terms ==== rare === Further reading === “raréfier”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012