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ozone▼(O3)noun[UK: ˈəʊ.zəʊn] [US: ˈoˌzoʊn]
ozone layer▼(a region of the stratosphere)noun[UK: ˈəʊ.zəʊn ˈleɪə(r)] [US: ˈoˌzoʊn ˈleɪər]
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