(chemistry) Any complex of a transition metal combined with carbon monoxide; they are typically volatile solids or liquids, soluble on common organic solvents but insoluble in water; they are highly toxic.

(inorganic chemistry) A toxic gas, COCl₂, used in the manufacture of plastics, pesticides etc, and once used as a chemical weapon.

(inorganic chemistry) The mixed oxide and sulfide of carbon COS.

(organic chemistry) The nitrile CO(C≡N)₂ that reacts explosively with water to form hydrogen cyanide and carbon dioxide

plural of metal carbonyl

(biochemistry) carboxyhemoglobin

(chemistry) Urea.

Alternative spelling of carbonyl sulfide

(organic chemistry) Alternative form of carbonyl cyanide

(organic chemistry, especially in combination) A univalent radical formed by deprotonation of a carboxyl group