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  1. Oxford American Dictionary

    ozone hole

    • IPA[ˈōˌzōn hōl]

    美式

    • n.
      a region of marked thinning of the ozone layer in high latitudes, chiefly in winter, attributed to the chemical action of chlorofluorcarbons and other atmospheric pollutants. The resulting increase in ultraviolet light at ground level gives rise to an increased risk of skin cancer.

    • noun: ozone hole, plural noun: ozone holes