From Longman Dictionary of Contemporary Englishall-terrainˌall-terˈrain adjective [only before noun] TTBall-terrain vehicles are very strong with thick tyres and are suitable for use in many different conditions an all-terrain bike
Examples from the Corpus
all-terrain• It's all part of a craze for driving high-speed all-terrain vehicles.• Would you rather have them roaming the countryside on trail bikes or all-terrain vehicles? 