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  1. Oxford American Dictionary

    Dobson unit

    • IPA[ˈdäbs(ə)n ˌyo͞onət]

    美式

    • n.
      a unit of measurement for the total amount of ozone in the atmosphere above a point on the earth's surface, one Dobson unit being equivalent to a layer of pure ozone 0.01 mm thick at standard temperature and pressure.

    • noun: Dobson unit, plural noun: Dobson units