an odorless very poisonous gas that is a product of incomplete combustion of carbon

[ Syn: carbon monoxide , carbon monoxide gas , co ]

a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition

[ Syn: cobalt , co , atomic number 27 ]

one who refuses to serve in the armed forces on grounds of conscience

[ Syn: conscientious objector , co ]

a state in west central United States in the Rocky Mountains

[ Syn: colorado , centennial state , co ]