coaster
//ˈkoʊstər//
Noun
coasterSingular
coastersPlural
1
A small flat mat or disc placed under a glass or cup to protect the surface of a table from moisture or heat.
Please use a coaster so you don't leave a ring on the table.
Noun
coasterSingular
coastersPlural
1
A ship that sails along the coast, typically engaged in trade between ports of the same country.
The coaster carried goods between the coastal towns.