Any agent that produces cancer, e.g. tobacco smoke, certain industrial chemicals, and ionizing radiation (such as X-rays and ultraviolet rays).
Chemical Engineering
A substance or agent that is capable of producing cancer in humans. Chemical substances such as benzene and phenol are known carcinogens. Exposure to ionizing radiation and ultraviolet radiation is also known to cause cancer. Asbestos and tobacco particles in the lungs are also known to cause cancer.
Biology
Any agent that produces cancer, e.g. tobacco smoke, certain industrial chemicals, and ionizing radiation (such as X-rays and ultraviolet rays).