Wiktionary
hexachloroacetone
n. (context organic compound English) An organic compound used mainly as a pesticide.
Wikipedia
Hexachloroacetone
Hexachloroacetone is an organic compound with the formula ClC-CO-CCl. It is also called hexachloropropanone or perchloroacetone. Numbers indicating the position of the chlorine-atoms are generally omitted as all the possible positions are substituted with chlorine. It is a colorless liquid, slightly soluble in water.
The main use of hexachloroacetone is as a pesticide. For the use of hexachloroacetone in the preparation of a novel insect repellent see Perkow reaction.