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
Sorry, no etymologies found.