nitrosate

from The Century Dictionary.

• noun In organic chemistry, a class-name of compounds which contain the group RC(ONO₂).C(R):NOH, where R is a hydrocarbon radical such as methyl, CH₃. They are formed by the addition of nitrogen tetroxid to aliphatic or aromatic hydrocarbons of the ethylene series.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb chemistry To introduce a nitroso group into a compound