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Definition of carboniferous adjective from the Oxford Advanced American Dictionary

     

    carboniferous

     adjective
    adjective
    NAmE//ˌkɑrbəˈnɪfərəs//
     
    (geology)
     
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  1. 1producing or containing coal
  2. 2Carboniferous of the period in the earth's history when layers of coal were formed underground
See carboniferous in the Oxford Advanced Learner's Dictionary
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