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Definition of carboniferous adjective from the Oxford Advanced Learner's Dictionary

carboniferous

adjective
 
/ˌkɑːbəˈnɪfərəs/
 
/ˌkɑːrbəˈnɪfərəs/
(geology)
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  1. producing or containing coal
  2. Carboniferous
     of the period in the earth’s history when layers of coal were formed undergroundTopics Historyc2
See carboniferous in the Oxford Advanced American Dictionary
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