1. One that coasts, as:
a. One who acts in an aimless manner.
b. A sled or toboggan.
c. One who rides a sled or toboggan.
2. Nautical A vessel engaged in coastal trade: "dirty British coaster with a salt-caked smokestack" (John Masefield).
3. A roller coaster.
a. A small mat or plate placed under a vessel to protect a tabletop or other surface beneath.
b. A small tray, often on wheels, for passing something, such as a wine decanter, around a table.
5. A resident of a coastal region.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.