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

  • n. See dirt bike.
  • n. See mountain bike.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A bicycle or motorcycle which is designed and used for off-road travel on rugged or inclined surfaces.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a lightweight motorcycle equipped with rugged tires and suspension; an off-road motorcycle designed for riding cross country or over unpaved ground


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