any of a group of substances that are used in plastics or other materials to impart viscosity, flexibility, softness, or other properties to the finished product.
2.
an admixture for making mortar or concrete workable with little water.
Main Entry: plas·ti·ciz·er Variant: or Britishplas·ti·cis·er/'plas-t&-"sI-z&r/ Function: noun : a chemical added especially to rubbers and resins to impart flexibility, workability, or stretchability