Definition of Archean in English :

Define Archean in English

Archean meaning in English

Meaning of Archean in English

Pronunciation of Archean in English

Archean pronunciation in English

Pronounce Archean in English

Archean

see synonyms of archean

Noun

1. archaeozoic, archaeozoic aeon, archean, archean aeon, archean eon, archeozoic, archeozoic eon

the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life

Adjective

2. archaean, archean

of or relating to the earliest known rocks formed during the Precambrian Eon

WordNet Lexical Database for English. Princeton University. 2010.


Archean

see synonyms of archean
adjective
a variant spelling (esp US) of Archaean

Collins English Dictionary. Copyright © HarperCollins Publishers


Archean

see synonyms of archean
adjective
[sometimes a-]
designating or of the geologic eon characterized by the development of the first igneous and metamorphic rocks and the first marine microorganisms; Precambrian, esp. early Precambrian

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.


Archean

see synonyms of archean
adj.
1. Of, relating to, or being the older of the two divisions of Precambrian time, from about 3.8 to 2.5 billion years ago, marked by an atmosphere with little free oxygen, the formation of the first rocks and oceans, and the development of unicellular life. See Table at geologic time.
2. Of, relating to, or being the oldest known rocks, those of the Precambrian Eon, that are predominantly igneous in composition.
n.
The Archean Eon. Also called Archeozoic.

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.