PALEOZOIC
Paleozoic
(adjective) of or relating to or denoting the Paleozoic era
Paleozoic, Paleozoic era
(noun) from 544 million to about 230 million years ago
Source: WordNet® 3.1
Adjective
paleozoic (not comparable)
Alternative form of Paleozoic
Etymology
Adjective
Paleozoic (comparative more Paleozoic, superlative most Paleozoic)
(geology) 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.
Proper noun
Paleozoic
(geology) The Paleozoic era.
Source: Wiktionary
Pa`le*o*zo"ic, a. Etym: [Paleo- + Gr. (Geol.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition