"nitrox : (metallurgy) An industrial process for case hardening (imparting greater surface hardness..."

“nitrox : (metallurgy) An industrial process for case hardening (imparting greater surface hardness to) metal objects, involving nitrocarburizing (the diffusion of carbon and nitrogen into the metal) followed by oxidation.
(underwater diving) A mixture of nitrogen and oxygen, the nitrogen content being lower than what is normally present in air, which is used in place of air as a breathing gas.
British diving engineer Henry Fleuss, who invented the first commercially practical scuba rebreather, was born on this day in 1851.”

- https://en.wiktionary.org/wiki/nitrox#English

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