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coaster

noun [C] (OBJECT)
 
 
/ˈkəʊ.stər/ US  /ˈkoʊ.stɚ/

Definition

a small piece of wood, plastic, or other material that you put a glass or cup on to protect a surface from heat or liquidDishes, bowls, cups and glasses
(Definition of coaster noun (OBJECT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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