To remove ozone from something or to cause ozone to break down.
From de- (to remove) + ozone + -ize (verb suffix). The verb form developed from the noun ozone in chemistry contexts.
In water treatment plants, they sometimes intentionally deozonize water after using ozone for purification, because leftover ozone can be harmful—it's a delicate balance between killing germs and making the water safe to drink.
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