Longman Dictionary of Contemporary English
The Collaborative International Dictionary
off-road \off-road\ adj. designed for or used for or taking place on trails and beaches etc., instead of public roads; as, off-road vehicles; off-road sports such as snowmobiling. [Narrower terms: {cross-country (vs. road) ]
Douglas Harper's Etymology Dictionary
Wiktionary
Designed for, used for, or taking place on a driving surface that is not traditionally paved, such as a beach or rugged terrain v
(context intransitive English) To travel in rugged terrain not on a paved track.
WordNet
adj. designed for or used for or taking place on trails and beaches etc instead of public roads; "off-road vehicles such as dune buggies"; "off-road sports such as snowmobiling"
Usage examples of "off-road".
Suddenly, what looked to Gunn like an off-road dune buggy flew out of the cavern of the aircraft and down the ramp.
You had to step up into the vehicle, which was built high for good ground clearance and off-road use.
To the northwest, in the Black Rock desert, hippies and aging punks and other fringe meatware had gathered for decades for their Burning Man Festival, an annual orgy of gunplay, punk rock, and off-road driving.
The soft sand exposed the inadequacies of the heavily laden motorbike, my inappropriate tyres and lack of off-road motorcycling experience.
I see some old tire tracks, but they look like some guy with an off-road bike has been up here.
There were two other cars in the garage: a massive Toyota Land Cruiser Amazon off-road car with four-wheel drive, which Grandpa used in weather like this.
We bounced over the dune, me and Kelly holding on to the roll bar in the back, and then all four of the big off-road tires bit into the loose sand and we were off.
While not a real off-road type—I hate 4-wheel-drive assholes who pride themselves on tearing up the landscape, and all snowmobilers, and those idiots on motorcycles who befoul the wilderness with noise and fumes—I have been known to push the Jeep pretty hard to get to a campsite far enough back to where I wouldn’t have to listen to anyone’s radio or hear traffic or have to look at the rump end of some fat-assed Winnebago.