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English definition of “oxidize”

oxidize

verb [I or T] uk (UK usually oxidise)   /ˈɒk.sɪ.daɪz/ us    /ˈɑːk-/
If a substance oxidizes, it combines with oxygen and loses hydrogen to form another substance, and if something oxidizes a substance, it causes it to do this: Iron oxidizes to form rust. When you heat fat, it oxidizes easily. If a chemical element oxidizes, it loses electrons (= very small pieces of matter with negative electrical charge) and if you oxidize it, you cause it to do this.
oxidization
noun [U] uk (UK usually oxidisation)   /ˌɒk.sɪ.daɪˈzeɪ.ʃən/ us    /ˌɑːk-/ (US usually oxidation)
(Definition of oxidize from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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