Definition of ozone noun from the Oxford Advanced Learner's Dictionary

     

    ozone

     noun
    noun
    BrE BrE//ˈəʊzəʊn//
     
    ; NAmE NAmE//ˈoʊzoʊn//
     
    [uncountable] The Earth and the atmosphere
     
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  1. 1 (chemistry) a poisonous gas with a strong smell that is a form of oxygen See related entries: The Earth and the atmosphere
  2. 2(British English, informal) air near the sea that smells fresh and pure
  3. Word Origin mid 19th cent.: from German Ozon, from Greek ozein ‘to smell’.Extra examples Ozone is formed when an electric spark is passed through oxygen. The ozone layer is disappearing over northern Europe. the discovery of massive springtime reductions in ozone over Antarctica
See the Oxford Advanced American Dictionary entry: ozone