Webster's English Dictionary

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paleozoic

Pa.leo.zo.ic \.pa--le--*-'zo--ik, esp Brit .pal-e-\ aj : of, relating to, 
   or being an era of geological history which extends fr om the beginning of 
   the Cambrian to the close of the Permian and is marked by the culmination 
   of nearly all classes of invertebrates except the insects and in the later 
   epochs of which seed-bearing plants, amphibians, and reptiles first 
   appeared; also : relating to the system of rocks formed in this era - 
   Paleozoic n