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jurassic

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Ju⋅ras⋅sic

  [joo-ras-ik] Geology
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–adjective
1. noting or pertaining to a period of the Mesozoic Epoch, occurring from 190 to 140 million years ago and characterized by an abundance of dinosaurs and the advent of birds and mammals.
–noun
2. the Jurassic Period or System.
Origin:
1825–35; Jur(a) + -assic, suffix extracted from Triassic; cf. F jurassique
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Ju·ras·sic   (jŏŏ-rās'ĭk)   
adj.  Of or belonging to the geologic time, rock series, or sedimentary deposits of the second period of the Mesozoic Era, in which dinosaurs continued to be the dominant land fauna and the earliest birds appeared. See Table at geologic time.
n.  The Jurassic Period or its system of deposits.

[French jurassique, after the Jura (Mountains).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

Jurassic 
"geological period between the Triassic and the Cretaceous," 1833, from Fr. Jurassique, lit. "of the Jura Mountains," between France and Switzerland, whose limestones were laid down during this period.
Online Etymology Dictionary, © 2001 Douglas Harper
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