Definition of 18-wheeler noun from the Oxford Advanced Learner's Dictionary

 

18-wheeler

 noun
noun
BrE BrE//ˌeɪtiːn ˈwiːlə(r)//
 
; NAmE NAmE//ˌeɪtiːn ˈwiːlər//
 
(North American English)
 
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a very large truck with nine wheels on each side
See the Oxford Advanced American Dictionary entry: 18-wheeler