Webster's English Dictionary

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cambrian

Cam.bri.an \'kam-bre--*n\ aj [ML Cambria Wales, fr. W Cymry Welshmen] 1: 
   WELSH  2: of, relating to, or being the earliest geologic period of the 
   Paleozoic  era or the corresponding system of rocks marked by fossils of 
   every great animal type except the vertebrate and scarcely recognizable 
   plant fossils - Cambrian n