PaleoarcheanWiktionary 原文英美构词拆解Paleopaleo-前缀archeanArchaean词干paleo-Old; ancient or primitive (Combining form of old, ancient, and primitive) · Related to paleontology.词源说明From paleo- + Archaean.释义形容词adjective1(geology) Of a geologic era within the Archaean eon from about 3600 to 3200 million years ago; the first aerobic bacteria appeared at this time.专有名词proper noun1(geology) The era from 3,600 Ma to 3,200 Ma.