Noun has 4 senses

• co(n = noun.substance) carbon monoxide, carbon monoxide gas - an odorless very poisonous gas that is a product of incomplete combustion of carbon;


• co(n = noun.substance) atomic number 27, cobalt - a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition;




• co(n = noun.person) conscientious objector - one who refuses to serve in the armed forces on grounds of conscience;


• co(n = noun.location) centennial state, colorado - a state in west central United States in the Rocky Mountains;