Ozone is a gas that is pale-blue, unstable and a form of oxygen.(noun)
An example of ozone is a gas used to purify water.
See ozone in Webster's New World College Dictionary
Origin: Fr < Gr ozein, to smell < IE base *od- > L odor
See ozone in American Heritage Dictionary 4
Origin: German Ozon
Origin: , from Greek ozon
Origin: , neuter present participle of ozein, to smell.
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