Coaster

Coaster can refer to:

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• Roller coaster
• Coastal trading vessel
• San Diego Coaster (commuter rail service)
• a small piece of material, usually composed of wood or of cardboard, used to prevent a drink and its container from contacting a surface, such as a table, and leaving a mark. To protect the surface or a table or of a bar from drips or from condensation, drinkers or waiters position a coaster before parking a glass on top of that coaster. A beermat is this kind of coaster. (see picture)
• a recordable compact disc or DVD which has not been recorded properly, and thus is useless as a data storage medium; by implication its only use is as a drink coaster.
• a person associated with a certain coast. In New Zealand, specifically, coaster refers to a person from the West Coast of the South Island of New Zealand.
• DVD coaster