Geology. noting or pertaining to a period of the Paleozoic Era, occurring from 570 million to 500 million years ago, when algae and marine invertebrates were the predominant form of life. See table under geologic time.
of or pertaining to Cambria; Welsh.
Geology. the Cambrian Period or System.
a native of Cambria; Welshman.

1580–90; < Medieval Latin Cambri(a) Wales, Latinization of MWelsh Cymry Wales, literally Welshmen (see Cymry) + -an

post-Cambrian, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Cambrian (ˈkæmbrɪən)
1.  of, denoting, or formed in the first 65 million years of the Palaeozoic era, during which marine invertebrates, esp trilobites, flourished
2.  of or relating to Wales
3.  the Cambrian the Cambrian period or rock system
4.  a Welsh person

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1650s, "from or of Wales or the Welsh," from Cambria, variant of Cumbria, Latinized derivation of Cymry, the name of the Welsh for themselves, from O.Celt. Combroges "compatriots." Geological sense (of rocks first studied in Wales and Cumberland) is from 1836.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Cambrian   (kām'brē-ən, kām'-)  Pronunciation Key 
The first period of the Paleozoic Era, from about 540 to 505 million years ago. During this time warm seas and desert land areas were widespread, and animal life diversified rapidly during what is known as the Cambrian Explosion. See Chart at geologic time.
The American Heritage® Science Dictionary
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