Definitions for paleozoicˌpeɪ li əˈzoʊ ɪk; esp. Brit. ˌpæl i-
Random House Webster's College Dictionary
Pa•le•o•zo•icˌpeɪ li əˈzoʊ ɪk; esp. Brit. ˌpæl i-(adj.)
noting or pertaining to a geologic era occurring between 570 million and 230 million years ago, when fish, insects, and reptiles first appeared.
(n.)the Paleozoic Era or group of systems.
Origin of Paleozoic:
1830–40; paleo - + -zoic
Paleozoic, Paleozoic era(adj)
from 544 million to about 230 million years ago
of or relating to or denoting the Paleozoic era
Of a geologic era within the Phanerozoic eon that comprises the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods from about 542 to 250 million years ago, from the age of trilobites to that of reptiles.
The Paleozoic era.
of or pertaining to, or designating, the older division of geological time during which life is known to have existed, including the Silurian, Devonian, and Carboniferous ages, and also to the life or rocks of those ages. See Chart of Geology