- chlorine, Cl, atomic number 17 - a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)
--1 is a kind of chemical element, element; gas; halogen
--1 is a substance of sodium chloride, common salt
--1 has particulars: radiochlorineDerived forms: verb chlorinate1, verb chlorinate2