/ ˈəʊzəʊn; NAmE ˈoʊzoʊn/ noun [ U ]
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
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WORD ORIGIN
mid 19th cent.: from German Ozon , from Greek ozein to smell.