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Archean 也作 Ar·chae·an AHD[är-kēʹən] D.J.[ɑːˈkiːən]K.K.[ɑrˈkiən]adj.（形容词）- Of or relating to the oldest known rocks, those of the Precambrian era, that are predominantly igneous in composition.太古代的：所知的最古的前寒武纪时代岩石，其组成成分主要为火成岩的，或与之相关的
- From Greek arkhaios [ancient] * see archaic 源自 希腊语 arkhaios [古代的] * 参见 archaic
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