Nitrosylation is a chemical reaction in which a nitrosyl group (-NO) is added to a molecule. This process is often used in biology to add nitric oxide to proteins, as it can modify their function. However, there are several synonyms for nitrosylate. One alternative is S-nitrosylation, which refers specifically to the attachment of a nitrosyl group to a cysteine residue in a protein. Another is NOylation, which is a more general term for the addition of a nitrosyl group to any molecule. Nitrosylation can also be referred to as nitrosation or nitration, depending on the specific context. Ultimately, these terms all describe a chemical reaction that involves the addition of a nitrosyl group to a molecule.