Definition of all-terrain in English:

all-terrain

adjective

US
  • Designating a vehicle or equipment designed for use on rough or difficult terrain. Also (of driving, cycling, etc.): done on rough or difficult terrain, making use of this type of vehicle or equipment.

Origin

1950s; earliest use found in The Lima News. From all + terrain.

Pronunciation

all-terrain

/ˌɔːltɪˈreɪn//ˌɔːltɛˈreɪn/