1. 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)
   "Chlorine is added to swimming pools to kill bacteria";
   - Cl, atomic number 17

Derived forms: chlorines

Type of: chemical element, element, gas, halogen

Part of: common salt, sodium chloride

Encyclopedia: Chlorine