The Collaborative International Dictionary
carbonyl choride
phosgene \phos"gene\ (f[o^]s"j[=e]n or f[o^]z"j[=e]n), n. (Chem.) A reactive chemical substance ( COCl2), also called carbonyl choride, used in synthesis of numerous substances. In the First Worlds War it was also used as a poisonous gas in combat.