A substance that removes oxygen from something or prevents something from oxidizing (rusting or corroding).
From de- (to remove) + oxidizer (a substance causing oxidation). The prefix de- comes from Latin, meaning 'away' or 'down,' while oxidize comes from oxide, relating to oxygen compounds.
Deoxidizers are used in welding to keep molten metal from rusting before it cools—without them, bridges and structures would be much weaker and more brittle from oxidation damage.
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