Although this term has, regrettably, been used to mean the N-nitroso derivatives of amides, logically it refers to amides of nitrous acid; the unstable parent compound H2NNO is, in fact, named nitrosamide, but its derivatives formed by substitution with hydrocarbyl groups are by long custom called nitrosamines.
See also: nitramines
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1352 (