nitrosation
/ˌnʌɪtrə(ʊ)ˈseɪʃn/ /ˌnʌɪtrə(ʊ)ˈzeɪʃn/Chemistry
noun
A reaction in which a nitroso compound is formed; the introduction of a nitrosyl group (NO) into a molecule, typically by reaction with nitric oxide.
Origin
1920s; earliest use found in Frederick Alfred Mason (b. 1888). From nitrosate + -ion, perhaps after French nitrosation.