Trihalomethanes. Any of several synthetic organic compounds formed when chlorine or bromine combine with organic materials in water.
a group of organic substances known as trihalomethanes, comprising for the purposes of the Regulations four substances: trichloromethane (also known as chloroform), dichlorobromomethane, dibromochloromethane and tribromomethane.
Trihalomethanes. Toxic chemical substances that consist of a methane molecule and one of the halogen elements fluorine, bromine, chlorine and iodine attached to three positions of the molecule. They usually have carcinogenic properties.