polystone en · NOUN
Etymology
From poly- + stone.
Meanings
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(uncountable) A mixture of polyurethane resin and other additives meant to produce a stone-like appearance.
The polystone pots are made of unsaturated resin, mixed with powdered stone additives to give a stone finish. The advantages of polystone over natural stone are more than the consideration of cost.
2014, Anne-Marie Powell, Plans for Small Gardens: Design, Build, Maintain, Enjoy: