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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 Ar·chae·an /ɑrˈkiən/
 (a.)太古化的

From: Webster's Revised Unabridged Dictionary (1913)

 Ar·chæ·an a.  Ancient; pertaining to the earliest period in geological history.

From: Webster's Revised Unabridged Dictionary (1913)

 Ar·chæ·an, n. Geol. The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life.
 Note: ☞ This is equivalent to the formerly accepted term Azoic, and to the Eozoic of Dawson.
 ◄ ►

From: WordNet (r) 2.0

 archaean
      adj : used of the earliest known rocks [syn: archean]