- The condition of being rarefied.
- a. A decrease in density and pressure in a medium, such as air, caused by the passage of a sound wave.b. The region in which this occurs.
Variant of rarefy
intransitive verbrarefied, rarefying
- to make or become thin, or less dense: the rarefied mountain air
- to make or become more refined, subtle, or lofty: a rarefied sense of humor
Origin of rarefyMiddle English rarefien ; from Middle French rarefier ; from Classical Latin rarefacere ; from rarus, rare + facere, to make, do