NCIt definition : Any of a class of organic compounds with the general formula R2NNO or RNHNO, present
in various foods and other products and found to be carcinogenic in laboratory animals.
(dictionary.com);
Alternative definition : NCI-GLOSS: A type of chemical found in tobacco products and tobacco smoke. Nitrosamines
are also found in many foods, including fish, beer, fried foods, and meats. Some nitrosamines
cause cancer in laboratory animals and may increase the risk of certain types of cancer
in humans.;