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.
an admixture for making mortar or concrete workable with little water.

1920–25; plasticize + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plasticizer or plasticiser (ˈplæstɪˌsaɪzə)
any of a number of substances added to materials in order to modify their physical properties. Their uses include softening and improving the flexibility of plastics and preventing dried paint coatings from becoming too brittle
plasticiser or plasticiser

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Add a plasticizer, which acts to lubricate the molecules, and the foam gets spongier and softer.
Addition of the super-plasticizer was made to increase strength and decrease permeability, not to increase workability.
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