Precambrian

Precambrian

[pree-kam-bree-uhn, -keym-] Geology.
adjective
1.
noting or pertaining to the earliest era of earth history, ending 570 million years ago, during which the earth's crust formed and life first appeared in the seas. See table under geologic time.
noun
2.
the Precambrian Era.
Also, Pre-Cambrian.


Origin:
1860–65; pre- + Cambrian

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To Precambrian
Collins
World English Dictionary
Precambrian or Pre-Cambrian (priːˈkæmbrɪən)
 
adj
1.  of, denoting, or formed in the earliest geological era, which lasted for about 4 000 000 000 years before the Cambrian period
 
n
2.  the Precambrian Archaeozoic See Proterozoic the Precambrian era
 
Pre-Cambrian or Pre-Cambrian
 
adj
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History

Precambrian
1864, from pre- + Cambrian (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Science Dictionary
Precambrian   (prē-kām'brē-ən, -kām'-)  Pronunciation Key 
The period of geologic time between Hadean Time and the Phanerozoic Eon, from about 3.8 billion to 540 million years ago. During the Precambrian Eon, which is divided into the Archean and Proterozoic, primitive forms of life first appeared on Earth. See Chart at geologic time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature