Longman Dictionary of Contemporary English homepage

coaster

 noun
     
Related topics: Drink, Water
coast‧er [countable]
1DFD a small thin object on which you put a glass, or cup, to protect a table from heat or liquids
2TTW a ship that sails from port to port along a coast, but does not go further out to sea
Definition from the Longman Dictionary of Contemporary English
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