Trihalomethanes

Part of speech: noun

Definitions

1. Chemical compounds containing three halogen atoms bonded to a methane molecule ; volatile substances often formed as byproducts in water disinfection processes ; substances studied for potential health effects due to their presence in treated water
2. Organic molecules that consist of one carbon atom bonded with hydrogen atoms replaced by three halogens ; commonly produced during chlorination of water supplies ; recognized for their occurrence as contaminants influenced by water treatment methods
3. Methane derivatives where three hydrogen atoms have been substituted by halogen elements ; typically generated during chemical reactions in water purification ; compounds monitored for environmental and health-related concerns associated with drinking water quality

Etymology: Trihalomethanes are a family of chemicals, not a single compound, and the name is a chemist's construction built from familiar pieces. Its first part, "tri-", is a Latin-derived prefix meaning three, while the Greek-derived "halo-" refers to the halogens, the group of reactive elements such as chlorine and bromine. "Methane" is the simplest hydrocarbon, a single carbon atom bonded to four hydrogens. A trihalomethane is therefore methane in which three of those hydrogens have been replaced by halogen atoms, and the name tells you exactly that structure. The plural form, "trihalomethanes," simply refers to the several members of this class, such as chloroform and bromoform, which can form when chlorine used to disinfect water reacts with naturally occurring organic matter. The word is a modern technical coinage built from classical and chemical roots, so it has no ancient history of its own.

Synonyms: THMs