Webster's English Dictionary

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carboniferous

car.bon.if.er.ous \.ka:r-b*-'nif-(*-)r*s\ aj 1: producing or containing 
   carbon or coal  cap  2: of, relating to, or being the period of the 
   Paleozoic era between the D evonian and the Permian or the corresponding 
   system of rocks - carboniferous n