coasters
n. countable B1 Intermediate US //ˈkoʊstɝz// UK //kˈəʊstəz// coast·ers
n. small mats or objects you place under a glass or cup to protect the table from water marks or heat.
n. small protective mats or trays placed beneath drinking vessels to prevent condensation or heat from damaging the underlying surface.
Please use coasters so you do not leave rings on the wooden table.
The host handed out marble coasters to the guests before serving the chilled cocktails.
While often overlooked as mere household accessories, high-quality coasters serve the dual purpose of preserving expensive furniture finishes and adding a decorative element to the living space.
Usage
Commonly used in the plural form as they are typically sold and used in sets.