Definition of coaster
1
:one that coasts: such as
a
:a person engaged in coastal traffic or commerce
b
:a ship sailing along a coast or engaged in trade between ports of the same country
2
:a resident of a seacoast
3 a
:a tray or decanter stand usually of silver and sometimes on wheels
b
:a shallow container or a plate or mat to protect a surface
4 a
:a small vehicle (such as a sled or wagon) used in coasting
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