Compounds having the nitroso group,
–NO. attached to carbon, or to another element, most commonly nitrogen or oxygen.
See: nitrosamines
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1352 (https://doi.org/10.1351/pac199567081307)