Producing, or produced by, the action of light; -- used specifically to designate a gas also called carbonyl chloride. See Carbonyl.
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.
A colorless to light yellow gas. Uses include pesticide and herbicide manufacture, dyes, production of isocyanates, and organic carbonates. Hazards: Highly toxic, symptoms include burning eyes, vomiting, and chest pain.