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Devonian

[duh-voh-nee-uh n] /dəˈvoʊ ni ən/
adjective
1.
Geology. noting or pertaining to a period of the Paleozoic Era, 405 to 345 million years ago, characterized by the dominance of fishes and the advent of amphibians and ammonites.
2.
of or pertaining to Devonshire, England.
noun
3.
Geology. the Devonian Period or System.
Origin
1605-1615
1605-15; < Medieval Latin Devoni(a) Devon + -an
Related forms
post-Devonian, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for postdevonian

Devonian

/dəˈvəʊnɪən/
adjective
1.
of, denoting, or formed in the fourth period of the Palaeozoic era, between the Silurian and Carboniferous periods, lasting 60-70 million years during which amphibians first appeared
2.
of or relating to Devon
noun
3.
the Devonian, the Devonian period or rock system
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for postdevonian
Devonian
1837, as a geological era, from the English county of Devon, where the Old Red Sandstone formations of that age are prominent.
Online Etymology Dictionary, © 2010 Douglas Harper
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postdevonian in Science
Devonian
  (dĭ-vō'nē-ən)   
The fourth period of the Paleozoic Era, from about 408 to 360 million years ago. During this time there were three major landmasses: most of modern day North America and Europe were located along the equator; a portion of Siberia was located to the north; and a continent consisting of South America, Australia, Africa, India, and Antarctica was located in the Southern Hemisphere. In the early Devonian small plants dominated the landscape, but by the end of the Devonian ferns and seed plants had appeared, as had the first forests. The first tetrapods (terrestrial vertebrates) and terrestrial arthropods appeared, as did many new types of fish. See Chart at geologic time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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