PaleoproterozoicWiktionary 原文英美构词拆解Paleopaleo-前缀proterozoicProterozoic词干paleo-Old; ancient or primitive (Combining form of old, ancient, and primitive) · Related to paleontology.词源说明From paleo- + Proterozoic.释义专有名词proper noun1(geology) The era from 2,500 Ma to 1,600 Ma, marked by a dramatic increase in atmospheric oxygen.形容词adjective1(geology) Of a geologic era within the Proterozoic eon from 2,500 to 1,600 million years ago.