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 from 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