oxidize

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oxi|dize /'ɒksɪdaɪz/ (oxidizes oxidizing oxidized)
in BRIT, also use oxidise
[VERB] be V-ed, V
When a substance is oxidized or when it oxidizes, it changes chemically because of the effect of oxygen on it.
Aluminium is rapidly oxidized in air...
The original white lead pigments have oxidized and turned black.

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