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 ]