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Silurian

[si-loo r-ee-uh n, sahy-] /sɪˈlʊər i ən, saɪ-/
adjective
1.
of or relating to the Silures or their country.
2.
Geology. noting or pertaining to a period of the Paleozoic Era, occurring from 425 to 405 million years ago, notable for the advent of air-breathing animals and terrestrial plants.
noun
3.
Geology. the Silurian Period or System of rocks.
Origin
1700-1710
1700-10; Silur(es) + -ian
Related forms
post-Silurian, adjective
pre-Silurian, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Silurian

Silurian

/saɪˈlʊərɪən/
adjective
1.
of, denoting, or formed in the third period of the Palaeozoic era, between the Ordovician and Devonian periods, which lasted for 25 million years, during which fishes first appeared
2.
of or relating to the Silures
noun
3.
the Silurian, the Silurian 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 Silurian
adj.

1708, "pertaining to the Silures," from Latin Silures "ancient British tribe inhabiting southeast Wales." Geological sense is from 1835, coined by Sir Roderick Impey Murchison (1792-1871) because rocks of this period are especially frequent in Wales.

Online Etymology Dictionary, © 2010 Douglas Harper
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Silurian in Science
Silurian
  (sĭ-lr'ē-ən)   
The third period of the Paleozoic Era, from about 438 to 408 million years ago. During this time glaciers that formed during the late Ordovician melted, causing sea levels to rise. The first coral reefs, fish with jaws, and freshwater fish appeared, and jawless fish continued to spread rapidly. The first vascular plants also appeared, as did land invertebrates including relatives of spiders and centipedes. See Chart at geologic time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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