n. any cancer-causing substance which a person ingests or comes in contact with, directly. Also, any cancer-initiating agent which someone gets exposed to, indirectly. Tobacco smoke, for instance, can be carcinogenic. So can exposure to asbestos, radon, and other radioactive material.

CARCINOGEN: "Tobacco smoke is a carcinogen which causes lung cancer."
Cite this page: N., Pam M.S., "CARCINOGEN," in, April 7, 2013, (accessed September 27, 2021).