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oxysulfide
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ozone

o·zone [ ṓ zn ]


noun 
Definition:
 
1. form of oxygen: a gaseous form of oxygen with three oxygen atoms per molecule, formed by electrical discharge in oxygen. Use: water purification. O3

2. fresh air: fresh pure air ( informal )

[Mid-19th century. Via German Ozon< Greek ozon, neuter present participle of ozein "smell"; from its pungent smell]
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