[joo-ras-ik] Geology.
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. See table under geologic time.
the Jurassic Period or System.

1825–35; Jur(a) + -assic, suffix extracted from Triassic; compare French jurassique

post-Jurassic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Jurassic (dʒʊˈræsɪk)
1.  of, denoting, or formed in the second period of the Mesozoic era, between the Triassic and Cretaceous periods, lasting for 55 million years during which dinosaurs and ammonites flourished
2.  the Jurassic the Jurassic period or rock system
[C19: from French jurassique, after the Jura (Mountains)]

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

"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. The name is said to be from Gaulish *iuris "wooded mountain."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Jurassic   (j-rās'ĭk)  Pronunciation Key 
The second and middle period of the Mesozoic Era, from about 208 to 144 million years ago. During this time the supercontinent Pangaea continued to split up and numerous shallow seas inundated the new continents. dinosaurs were the dominant form of terrestrial animal life, and the earliest birds appeared. Marine life was dominated by ammonites and belemnites, and sponges, corals, bryozoa, and gastropods all flourished. Gymnosperms and cycads were the dominant land plants. See Chart at geologic time.
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