from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sturdy bicycle distinguished by wide tires and horizontal handlebars, often used for off-road cycling. Also called dirt bike, trail bike.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A bicycle specially designed for off-road riding, typically with straight, flat handlebars, a heavier frame than road bikes, higher ground clearance, and wider tires, sometimes with knobs on them for greater traction.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous country
Sorry, no etymologies found.