A tractor-trailer or big rig, consisting of a semi-trailer and a semitruck pulling it; in American English referred to as semi-trailer truck or 18-wheeler.
semi-trailer truck
noun
A tractor-trailer or big rig, consisting of a semi-trailer and a semitruck pulling it.
How often have the words articulated lorry and semi-trailer truck occurred in a corpus of books? (source: Google Ngram Viewer )