<chemical> A carcinogen that is often used in experimental cancer studies. ... Pharmacological action: carcinogens. ... Chemical name: Benz(j)aceanthrylene, 1,2-dihydro-3-methyl- ... (12 Dec 1998) ... 
(= 3-methylcholanthrene) Carcinogenic polycyclic hydrocarbon. One of many such substances formed during incomplete combustion of organic material.