Archean

名词 archean:

1. the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
   同义词：Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon

形容词 archean:

1. used of the earliest known rocks
   同义词：archaean

Archean 也作 Ar.chae.an

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

来源：
From Greek arkhaios [ancient] * see archaic
源自 希腊语 arkhaios [古代的] *参见 archaic