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

activated carbon, barium monoxide, carbon, carbon 14, carbon arc, carbon arc lamp, carbon atom, carbon black, carbon copy, carbon cycle, carbon dating, carbon dichloride, carbon dioxide, carbon dioxide acidosis, carbon disulfide, carbon monoxide gas, carbon monoxide poisoning, carbon nanotube, carbon paper, carbon process, carbon steel, carbon tet, carbon tetrachloride, carbon tetrahalide, carbon transmitter, monoxide