ozone 
ozone BrE [ˈəʊzəʊn] NAmE [ˈoʊzoʊn] noun uncountable 1. (chemistry)a poisonous gas with a strong smell that is a form of ↑oxygen 2. (BrE, informal)air near the sea that smells fresh and pure Word Origin: [ozone] mid 19th cent.: from German Ozon, from Greek ozein ‘to smell’. Example Bank: •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
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