oxidize

American  

[ok-si-dahyz] / ˈɒk sɪˌdaɪz /

especially British, oxidise

verb (used with object)

• oxidizes,
  present (3rd person singular)
• oxidized,
  past participle,  past
• oxidizing
  present participle

1. to convert (an element) into an oxide; combine with oxygen.

2. to cover with a coating of oxide or rust.

3. to take away hydrogen from, as by the action of oxygen; add oxygen or any nonmetal to.

4. to remove electrons from (an atom or molecule), thereby increasing the valence.

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verb (used without object)

• oxidizes,
  present (3rd person singular)
• oxidized,
  past participle,  past
• oxidizing
  present participle

1. to become oxidized.

2. (especially of white wine) to lose freshness after prolonged exposure to air and often to darken in color.

oxidize British  

/ ˈɒksɪˌdaɪz /

verb

1. to undergo or cause to undergo a chemical reaction with oxygen, as in formation of an oxide

2. to form or cause to form a layer of metal oxide, as in rusting

3. to lose or cause to lose hydrogen atoms

4. to undergo or cause to undergo a decrease in the number of electrons Compare reduce

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oxidize Scientific  

/ ŏk′sĭ-dīz′ /

1. To undergo or cause to undergo oxidation.

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Other Word Forms

Derived Forms

• oxidizability
  noun
• oxidization
  noun
• overoxidize
  verb
• reoxidize
  verb
• underoxidize
  verb (used with object)
• antioxidizing
  adjective
• half-oxidized
  adjective
• nonoxidizable
  adjective
• nonoxidizing
  adjective
• oxidable
  adjective
• oxidizable
  adjective
• unoxidizable
  adjective
• unoxidized
  adjective

Inflected Forms

Participles

• oxidizing
  present
• oxidized
  past

Conjugated Forms

Present

• oxidize
  simple
• oxidizes
  simple
• have oxidized
  perfect
• has oxidized
  perfect
• am oxidizing
  progressive
• are oxidizing
  progressive
• is oxidizing
  progressive
• have been oxidizing
  perfect progressive
• has been oxidizing
  perfect progressive

Past

• oxidized
  simple
• had oxidized
  perfect
• was oxidizing
  progressive
• were oxidizing
  progressive
• had been oxidizing
  perfect progressive

Future

• will oxidize
  simple
• will have oxidized
  perfect
• will be oxidizing
  progressive
• will have been oxidizing
  perfect progressive

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Etymology

Origin of oxidize

First recorded in 1795–1805; oxide + -ize

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Explanation

To oxidize is to chemically combine with oxygen. If you have a rusty car, that is the result of "oxidizing." In chemistry class, you'll probably learn about oxidizing, which is when oxygen molecules combine with other molecules to produce an oxide. The most common example of oxidizing is rusting: oxygen interacts with iron molecules to produce the new (and unwelcome) iron oxide molecules, better known as rust. There are other types of oxidizing too, such as how the oxygen in our bodies is used to break down sugars. Oxidizing is a type of chemical reaction.

Example Sentences

See Examples For:

oxidize oxidizes oxidized oxidizing

“The presence of ferrihydrite tells us something specific about Mars' past environment,” Valentinas said, describing the cold and pH neutral waters that must have existed to oxidize the soil.

From Salon ● Mar. 1, 2025

"Ice is like armor. Melt it and you create windows for groundwater to get into rock that has not seen water and oxygen for millennia, and it will begin to oxidize quite quickly," Manning said.

From Science Daily ● Apr. 23, 2024

These, Borduas-Dedekind explains, oxidize in the air, forming larger molecules that can easily absorb water and form clouds.

From National Geographic ● Feb. 16, 2024

Over time, the shiny brass exterior will oxidize, giving the pencil holder a vintage, worn-in feel.

From Los Angeles Times ● Nov. 1, 2023

Perhaps there is an exotic inorganic chemistry in the Martian soil that is able by itself, in the absence of Martian microbes, to oxidize foodstuffs.

From "Cosmos" by Carl Sagan

When olive oil is exposed to fluctuations in temperature, light and air, which oxidizes the oil to its detriment, its quality diminishes.

From Salon ● Jan. 19, 2025

This suggested that microscopic plankton living on the surface of the seas produce sulfur in the form of a gas, dimethyl sulphide, that once in the atmosphere, oxidizes and forms small particles called aerosols.

From Science Daily ● Nov. 27, 2024

Food is an organic compound: it congeals, runs, discolors and oxidizes over time and because of the conditions in the kitchen you’re shooting in.

From Los Angeles Times ● Jun. 9, 2023

This oxidizes the oils, and oxidized oils are inflammatory.

From Seattle Times ● Mar. 6, 2023

"Over time, it partly oxidizes, which keeps providing sites for nutrients to bind to."

From "1491" by Charles C. Mann

They don’t have coffee, but they do have Jeju Island–grown “Regenerative Organic-Certified” black tea oxidized as matcha.

From Slate ● May 8, 2026

“I was talking about stale, oxidized matcha powder, but I completely get that it came off a very wrong way. I chose the wrong words and I really apologize for that.”

From Salon ● May 17, 2025

She also suggested the Republic of Tea’s Darjeeling Black Full Leaf Tea, which “is less oxidized than most black teas, so you're going to get more fruity flavors and more floral flavors,” Ziata explained.

From Salon ● Apr. 18, 2025

There is evidence that these bacteria gain energy by reducing highly oxidized forms of sulfur to less oxidized ones.

From Science Daily ● Mar. 13, 2024

My palms are faintly green, for like everything else on the ship, the tiller wheel has turned to copper and has oxidized green in the salt sea air.

From "Challenger Deep" by Neal Shusterman

At an Alaskan research station she inhales the scent of oxidizing permafrost: “Pleistocene-aged grass, mammoth bones, and thousands and thousands of years of microbial cells.”

From The Wall Street Journal ● Oct. 9, 2026

And a 2016 US government study found perchlorate, an oxidizing agent used in fireworks, had made its way into groundwater and surface water around Mount Rushmore National Memorial, which holds annual July 4 shows.

From Barron's ● Jul. 2, 2026

They found that adding dimethylammonium formate, or DMAFo, to the perovskite solution before coating could prevent the materials from oxidizing.

From Science Daily ● Mar. 22, 2024

All these photocatalysts require high energy light for excitation and their oxidizing power has not yet been fully exploited.

From Science Daily ● Feb. 9, 2024

The transition to an oxidizing atmosphere posed a supreme crisis in the history of life, and a great many organisms, unable to cope with oxygen, perished.

From "Cosmos" by Carl Sagan

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