Tetrachlorodibenzo

Part of speech: noun

Definitions

1. A chemical name prefix for a dibenzo ring compound carrying four chlorine atoms, as in the dioxins and furans
2. Describes an organic compound built from two linked benzene rings that has four chlorine atoms attached to it
3. Denotes a class of toxic chlorinated aromatic molecules in which four chlorine atoms replace hydrogen on a dibenzo structure

Etymology: Tetrachlorodibenzo is a systematic chemical name, built the way the International Union of Pure and Applied Chemistry (IUPAC) assembles names for organic compounds. It has no older story of its own: chemists constructed it from parts, each one describing a feature of the molecule. "Di" means two, "benzo" refers to the benzene ring, "tetra" means four, and "chloro" refers to chlorine atoms. "Dibenzo" signals two benzene rings fused or linked together, so the whole name reads as a two-ring structure carrying four chlorine atoms. The word is a stem rather than a complete name, so chemists add numbers and a suffix to specify exactly where the chlorines sit. The full names of the compounds in this family, the tetrachlorodibenzodioxins and tetrachlorodibenzofurans, follow that pattern and are the ones most often seen in environmental and toxicology reports. The dioxins in particular became widely known because they form as unwanted byproducts of some industrial and combustion processes.