Definition of mountainous adjective from the Oxford Advanced American Dictionary

     

    mountainous

     adjective
    adjective
    NAmE//ˈmaʊntn̩əs//
     
     
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  1. 1having many mountains a mountainous region/terrain
  2. 2very large in size or amount; like a mountain synonym huge mountainous waves
See the Oxford Advanced Learner's Dictionary entry: mountainous