To remove oxygen from a chemical compound or substance through a chemical reaction.
De- (remove) + oxidize, though 'dooxidize' appears to be a rare or specialized variant spelling. It follows the pattern of scientific terminology borrowed from Latin and Greek.
This word is so rare that most chemists would actually say 'de-oxidize' or 'reduce' instead—it's a beautiful example of how technical language evolves around what practitioners actually use, not what perfect grammar suggests.
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