plural coasters
1
: a small, flat object on which a glass, cup, or dish is placed to protect the surface of a table
Set the glass on a coaster.
2
chiefly US
: roller coaster sense 1
3
: a ship that sails along a coast or that is used in trade between ports of the same country
Cite this Entry
“Coaster.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/coaster. Accessed 18 Jun. 2026.
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