(pharmacology) A parasympathomimetic drug that is rapidly broken down in the body, used for cataract surgery.

(physics) The minor stable isotope of chlorine, ³⁷₁₇Cl, having seventeen protons and twenty neutrons; it amounts to about 24% of the element in nature

(physics) The major stable isotope of chlorine, ³⁵₁₇Cl, having seventeen protons and eighteen neutrons; it amounts to about 76% of the element in nature

(physics) A long-lived radioactive isotope of chlorine, ³⁶₁₇Cl, having seventeen protons and nineteen neutrons, and a half-life of 3x10⁵ years; it can be used to date samples of groundwater

(inorganic chemistry) The calcium salt of hydrochloric acid, CaCl₂; used as a drying agent and to melt ice on roads.

(inorganic chemistry) The barium salt of hydrochloric acid, BaCl₂; it is toxic, and has been used as a rat poison.

(chemistry) The halogenated unsaturated organic compound 1,1-dichloroethene, CH₂=CCl₂; used in the preparation of polyvinylidene chloride film

(chemistry) A polymer of vinylidene chloride (CH₂=CCl₂) used as a thin film to wrap and preserve foodstuffs etc.

(inorganic chemistry) The zinc salt of hydrochloric acid, ZnCl₂, a white crystalline solid with a number of industrial applications.

(inorganic chemistry) The cadmium salt of hydrochloric acid, CdCl₂; it is used in photography and dyeing, and in the preparation of other cadmium compounds