Oxidize

Don't leave the metal exposed to the air or it will oxidize.

Is it not the case that un-oxidized PUFAs (poly-unsaturated fatty acids) may oxidize inside our body's cells and thus incur damage?

Saturated fats may be healthier than poly-unsaturated fats. The latter oxidize easily, while saturated fats remain stable.

Green and black tea come from the same plant, known as Camellia sinensis. But black tea is processed in a way that allows it to quickly oxidize, meaning that it usually has much lower levels of those precious catechins that Dr. Hara and other researchers rave about.

The Collins reagent is used to oxidize primary alcohols into aldehydes.

Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis:[…]. The evolutionary precursor of photosynthesis is still under debate, and a new study sheds light. The critical component of the photosynthetic system is the “water-oxidizing complex”, made up of manganese atoms and a calcium atom.