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Pa·le·o·zo·ic AHD[pā'lē-ə-zōʹĭk] D.J.[ˌpeɪliːəˈzəʊɪk]K.K.[ˌpeliəˈzoɪk]adj.（形容词）- Of, belonging to, or designating the era of geologic time that includes the Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, and Permian periods and is characterized by the appearance of marine invertebrates, primitive fishes, land plants, and primitive reptiles. See table at geologic time 古生代的：地质时代的一个时期的，属于这个时期的或这么称呼的，包括寒武纪、奥陶纪、志留纪、泥盆纪、密西西比纪、宾夕法尼亚纪和二叠纪时期，并且以海洋无脊椎动物、原始鱼类、陆地植物和早期爬行动物的出现为特征 参见 geologic time
n.（名词）- The Paleozoic Era.古生代
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