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archeozoic

 - 4 dictionary results

Ar⋅che⋅o⋅zo⋅ic

  [ahr-kee-uh-zoh-ik] Geology
Use archeozoic in a Sentence
–adjective
1. noting or pertaining to the earlier half of the Precambrian Era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms, blue-green algae and bacteria, have been recovered.
–noun
2. the Archeozoic division of geologic time or the rock systems formed then.
Also, Archaeozoic.

Origin:
1870–75; archeo- + Gk zō() life + -ic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To archeozoic
Ar·che·an also Ar·chae·an   (är-kē'ən)   
adj.  

  1. Of or belonging to the earlier of the two divisions of Precambrian time, from approximately 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 or relating to the oldest known rocks, those of the Precambrian Eon, that are predominantly igneous in composition.

n.  The Archean Eon. Also called Archeozoic.

[From Greek arkhaios, ancient; see archaic.]
Ar·che·o·zo·ic also Ar·chae·o·zo·ic   (är'kē-ə-zō'ĭk)   
n.  See Archean.
Ar'che·o·zo'ic adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
Archeozoic also Archaeozoic   (är'kē-ə-zō'ĭk)  Pronunciation Key 
See Archean.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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