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coaster

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coaster/ˈkoʊstɚ/noun
pluralcoasters
coaster
/ˈkoʊstɚ/
noun
pluralcoasters
Learner's definition of COASTER  
[count]
: a small, flat object on which a glass, cup, or dish is placed to protect the surface of a table
chiefly US  : roller coaster 1
: a ship that sails along a coast or that is used in trade between ports of the same country
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