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monorail

noun [C]
 
 
/ˈmɒn.ə.reɪl/ US  /ˈmɑː.nə-/

Definition

a railway system that has a single rail (= long metal bar on which the train travels) often above ground level, or the train that travels along itRailways and railway lines
(Definition of monorail noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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