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chlorhexidine (klor-heks-i-deen) n. an antiseptic used in solutions to disinfect and cleanse the skin (before surgery and to treat wounds and burns). It is also used as a mouthwash, gel, or spray for treating mouth ulcers and gingivitis. Trade names:. Cepton,. Chlorohex,. Corsodyl,. Hibisol,. Hibitane, etc.