coaster

[koh-ster]
noun
1.
a person or thing that coasts.
2.
a small dish, tray, or mat, especially for placing under a glass to protect a table from moisture.
3.
a ship engaged in coastwise trade.
4.
a sled for coasting.
5.
a tray for holding a decanter to be passed around a dining table.

Origin:
1565–75; coast + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coaster (ˈkəʊstə)
 
n
1.  (Brit) a vessel or trader engaged in coastal commerce
2.  a small tray, sometimes on wheels, for holding a decanter, wine bottle, etc
3.  a person or thing that coasts
4.  a protective disc or mat for glasses or bottles
5.  (US) short for roller coaster
6.  (W African) a European resident on the coast

Coaster (ˈkəʊstə)
 
n
(NZ) a person from the West Coast of the South Island, New Zealand

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

coaster
1570s, "one who sails along coasts," from coast in verbal sense. Applied to vessels for such sailing from 1680s. Tabletop drink stand (c.1887), originally "round tray for a decanter," so called from a resemblance to a sled, or because it "coasted" around the table to each
guest in turn after dinner. (Coast (v.) in sense "to go around the sides or border" of something is from mid-14c.)
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In a roller coaster you can only see the back of people's heads, but on this
  you could see beautiful marshlands.
Roller coaster connoisseurs tend to dismiss water rides as too slow, too tame,
  and too wet.
She has a roller coaster of a nose, unraveled hair, and sandal straps that look
  as if they're devouring her legs.
But while he survived the first scare, an eight-month roller coaster followed.
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