Definition of Archaean
1. Adjective. Of or relating to the earliest known rocks formed during the Precambrian Eon.
Definition of Archaean
1. a microorganism of the archaea [n -S]
Medical Definition of Archaean
1.
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.
This is equivalent to the formerly accepted term Azoic, and to the Eozoic of Dawson.
Source: Websters Dictionary
(01 Mar 1998)
Lexicographical Neighbors of Archaean
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