1. (noun) carbon monoxide, carbon monoxide gas, CO
an odorless very poisonous gas that is a product of incomplete combustion of carbon
Synonyms: carbon monoxide gas, carbon monoxide, conscientious objector, cobalt, atomic number 27
2. (noun) cobalt, Co, atomic number 27
a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
Synonyms: carbon monoxide gas, carbon monoxide, conscientious objector, cobalt, atomic number 27
3. (noun) conscientious objector, CO
one who refuses to serve in the armed forces on grounds of conscience
Synonyms: carbon monoxide gas, carbon monoxide, conscientious objector, cobalt, atomic number 27
4. (noun) Colorado, Centennial State, CO
a state in west central United States in the Rocky Mountains
Synonyms: carbon monoxide gas, carbon monoxide, conscientious objector, cobalt, atomic number 27
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Synonyms for co 
