Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A bicycle race on a dirt track with steep hills and sharp curves.
  • noun A bicycle with a stout frame, knobby tires, and usually 20-inch wheels, used for racing on such a track and for performing tricks.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism Bicycle motocross, a form of cycling on bicycles with 20-inch (508-mm) wheels, originating in California in the 1970s.

Etymologies

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

[Abbreviation and respelling of bicycle motocross using the letter X to represent the word cross.]

Examples

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