the uppermost layer of a planet's atmosphere / an extremely thin atmosphere, as on Saturn's moon Dione

In a human manner.

(astronomy) Abbreviation of pulsar. / (aviation) Initialism of primary surveillance radar. / Initialism of police service representative, an LAPD dispatcher. / Initialism of pre-sentence report.

(chemistry) A chemical engineering process in which hydrocarbons are hydrogenated and desulfurized catalytically as part of oil refining