What does deoxidise mean?
Deoxidise is a technical verb meaning to remove oxygen from a substance, most commonly through chemical reduction. It is chiefly at home in metallurgy and chemistry: molten metals are deoxidised with agents such as aluminium, silicon, or carbon to strip away dissolved oxygen and prevent defects in the final product, while laboratory chemists may deoxidise metal oxides using gases like hydrogen. The word is built transparently from the prefix de- ('removal') plus oxide, so its meaning is easy to infer even for readers encountering it for the first time. Its natural opposite is oxidise, which describes adding oxygen rather than removing it, and the two terms often appear together when describing reversible reactions. Though largely confined to scientific and industrial writing, deoxidise is precise and unambiguous, making it the preferred term whenever the specific removal of oxygen — rather than general reduction — is meant.
verbTo remove oxygen from a substance, typically by chemical means, as in reducing a metal oxide back to its metallic form.
- To remove oxygen from a substance by chemical means, especially in metallurgy or chemistry.
- (Of an agent) to act as a reducing agent that strips oxygen from another compound.
"The furnace operators added charcoal to the melt to deoxidise the iron and improve its quality."
"The chemist used hydrogen gas to deoxidise the copper oxide in the heated tube."
"Aluminium is often added to molten steel to deoxidise it before casting."
Every time a blacksmith turns rust-red ore into gleaming steel, deoxidise is doing the heavy lifting — it's the verb behind humanity's oldest chemistry trick.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of deoxidise
Deoxidise is formed within English from the prefix de-, indicating removal or reversal, combined with oxide, the noun for a compound of oxygen with another element. Oxide itself derives ultimately from French oxyde, coined in connection with Greek oxys, meaning 'sharp' or 'acid', the same root that gives us oxygen and acid. The verb arose in the context of early modern chemistry as scientists formalised the vocabulary of oxidation and reduction, alongside cognates such as oxidise, dioxide, and antioxidant.
Related word forms
How deoxidise is actually used
A technical term used mainly in metallurgy, chemistry, and industrial contexts; rare in everyday speech. The spelling 'deoxidize' is standard in American English, while 'deoxidise' follows British conventions.
Easily confused with deoxidise
Oxidise means to add oxygen to a substance, whereas deoxidise means to remove it — they are opposite processes.