[pey-lee-uh-zoh-ik or, especially Brit., pal-ee-] 
Geology| 1. | noting or pertaining to an era occurring between 570 million and 230 million years ago, characterized by the advent of fish, insects, and reptiles. |
| 2. | the Paleozoic Era or group of systems. |
| Pa·le·o·zo·ic (pā'lē-ə-zō'ĭk) adj. 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. n. The Paleozoic Era. |
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