トリハロメタントリハロメタンMeanings1nountrihalomethaneA class of chemical compounds; often encountered in contexts of water quality and disinfection byproducts.水すい道どう水すいに含ふくまれるトリハロメタンの濃のう度どが基き準じゅん値ちを超こえた。The concentration of trihalomethanes in the tap water exceeded the standard value.