[vahy-nil-i-deen] 
| a colorless, volatile, flammable liquid, C2H2Cl, that is copolymerized chiefly with vinyl chloride to form saran. |
vinylidene chloride
a colourless, dense, toxic, volatile, flammable liquid belonging to the family of organic halogen compounds, used principally in combination with vinyl chloride, acrylonitrile, or methyl methacrylate for the manufacture of a class of plastics called saran. Vinylidene chloride is also used as a starting material for making methylchloroform, or 1,1,1-trichloroethane, a solvent useful in cleaning electrical machinery.
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