semitrailer /ˈsɛˌmaɪˌtreɪlɚ/ noun plural semitrailers
plural semitrailers
Learner's definition of SEMITRAILER
[count] US
1
: a long trailer that has wheels at the rear and is attached at its forward end to a large truck半拖车;半挂车
2
: a large truck with a long trailer attached to the back of it半拖卡车;半拖货车 — see picture at truck