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rarefy

rar·e·fy [ rérrə f ] (past and past participle rar·e·fied, present participle rar·e·fy·ing, 3rd person present singular rar·e·fies)

verb

Definition:

1. transitive and intransitive verb become or make something less dense: to make something, especially a gas, less dense, or become less dense

2. transitive verb make something more refined: to make something less connected with or typical of the ordinary

[14th century. Directly or via French raréfier< medieval Latin rareficare< Latin rarefacere "make rare" < rarus "scarce" + facere "do"]

rar·e·fi·a·ble [ rérrə f əb'l, rérrə f əb'l ] adjective

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