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Precambrian

[pree-kam-bree-uh n, -keym-] /priˈkæm bri ən, -ˈkeɪm-/
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.
noun
2.
the Precambrian Era.
Also, Pre-Cambrian.
Origin
1860-1865
1860-65; pre- + Cambrian
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pre-cambrian

Precambrian

/priːˈkæmbrɪən/
adjective
1.
of, denoting, or formed in the earliest geological era, which lasted for about 4 000 000 000 years before the Cambrian period
noun
2.
the Precambrian, the Precambrian era See Archaeozoic, Proterozoic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for pre-cambrian

Precambrian

adj.

also Pre-Cambrian, 1861, from pre- + Cambrian.

Online Etymology Dictionary, © 2010 Douglas Harper
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pre-cambrian in Science
Precambrian
  (prē-kām'brē-ən, -kām'-)   
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.
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