nitrosyl
/ˈnʌɪtrəsʌɪl/ /ˈnʌɪtrəsɪl/ /nʌɪˈtrəʊsʌɪl/Chemistry
noun
The group —N=O; the cation NO+. Also: a complex containing nitric oxide (NO) bonded to a metal atom as a neutral ligand.
Origin
Mid 19th century; earliest use found in Chemical News. From nitroso- + -yl.