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WordReference Random House Unabridged Dictionary of American English © 2024Si•las•tic (si las′tik),USA pronunciation [Trademark.]- Chemistry, Trademarksa brand name for any of a group of substances containing polymeric silicones, having the properties of rubber but more capable of withstanding extremely high and low temperatures and other causes of deterioration, used in jet-plane engines, medical prosthetic devices, gaskets, electrical insulation, etc.
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