Definition of monorail noun from the Oxford Advanced American Dictionary

     

    monorail

     noun
    noun
    NAmE//ˈmɑnəˌreɪl//
     
     
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  1. 1 [uncountable] a railroad system in which trains travel along a track consisting of a single rail, usually one placed high above the ground
  2. 2[countable] a train used in a monorail system
See the Oxford Advanced Learner's Dictionary entry: monorail