名詞 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
   同義詞：Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon

形容詞 archean:

1. used of the earliest known rocks
   同義詞：archaean

Archean 也作 Ar.chae.an

adj.（形容詞）
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紀(jì)時(shí)代巖石，其組成成分主要為火成巖的，或與之相關(guān)的

來源：
From Greek arkhaios [ancient] * see archaic
源自 希臘語 arkhaios [古代的] *參見 archaic