The Collaborative International Dictionary of English v.0.48:
off-roader \off-roader\ n. a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous country; amountain bike. Syn: mountain bike, all-terrain bike. [WordNet 1.5]WordNet (r) 3.0 (2006):
off-roader n 1: a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous country [syn: mountain bike, all-terrain bike, off-roader]