Trichloroacetic

Part of speech: adjective

Definitions

1. Containing or derived from a compound in which three chlorine atoms replace hydrogen atoms in acetic acid
2. Describing a chemical substance made by substituting three chlorine atoms into the structure of acetic acid
3. Relating to an acid formed when three hydrogen atoms of acetic acid are swapped for chlorine atoms

Etymology: Trichloroacetic acid is a chemical compound built from two parts that describe its structure. "Acetic" comes from Latin "acetum," meaning vinegar, the source of the sour liquid that gives vinegar its taste and which chemists later identified as acetic acid. "Trichloro" is a chemical prefix signalling three chlorine atoms attached to the molecule in place of hydrogen atoms. Combined, the name tells a chemist exactly what the molecule is: a vinegar-type acid carrying three chlorine atoms. The result is a substance far stronger and more reactive than the acetic acid in your kitchen. Chlorine atoms pull electrons away from the carboxyl group, which makes the molecule much more willing to release its hydrogen, so the acid is markedly stronger than its parent. The name is a straightforward piece of systematic chemical naming, where each prefix records a specific change to a known structure.