"A semi-tractor-trailer truck, also known simply as a semi-trailer truck, tractor-trailer truck, semi-tractor truck, semi-truck, trailer truck or tractor truck, is the combination of a tractor ...
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unit and one, or more, semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth-wheel.
It is variously known as a transport truck, transfer truck or articulated truck, abbreviated artic, in Canada, semi-lorry or single lorry in Australia and New Zealand, semi-tractor-trailer, semi-trailer, tractor-trailer, semi-tractor, semi, trailer, tractor, big rig or eighteen-wheeler in the United States and articulated lorry in the United Kingdom and Ireland." - (en.wikipedia.org 21.12.2019)
