Definition of tractor-trailer noun from the Oxford Advanced American Dictionary

 

tractor-trailer

 noun
noun
 
(also trailer truck, informal rig, semi)
 
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a large truck with two sections, one in front where the driver sits and one behind for carrying goods. The sections are connected by a flexible joint so that the tractor-trailer can turn corners more easily. see also articulated
See the Oxford Advanced Learner's Dictionary entry: tractor-trailer