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
3a
: 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
4a
: a small vehicle (such as a sled or wagon) used in coasting
b
: roller coaster
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Merriam-Webster unabridged
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Time Traveler for coaster
The first known use of coaster was in 1574
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