Definitions

from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • n. A rocket-propelled sled that travels along rails and is used to study acceleration, deceleration, and crash survival techniques.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rocket-propelled vehicle constrained to run on a rail used for experimental purposes.

Etymologies

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