trihalomethane

/traɪˌhæləˈmɛθeɪn/
noun
  1. A chemical compound containing three halogen atoms (such as chlorine or bromine) bonded to a methane molecule, often formed as a byproduct when water is disinfected with chlorine.
    • Long-term exposure to high levels of trihalomethane in tap water may pose health risks.
    • The water treatment plant monitors trihalomethane levels to ensure the drinking water is safe.
    • Scientists are studying ways to reduce trihalomethane formation during the disinfection process.