[trahy-as-ik] Geology.
noting or pertaining to a period of the Mesozoic Era, occurring from 230 to 190 million years ago and characterized by the advent of dinosaurs and coniferous forests. See table under geologic time.
Also, Trias [trahy-uhs] . the Triassic Period or System.

1835–45; Trias the three-part series of strata characterizing the period (< German < Greek triás; see triad) + -ic

post-Triassic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Triassic (traɪˈæsɪk)
1.  of, denoting, or formed in the first period of the Mesozoic era that lasted for 42 million years and during which reptiles flourished
2.  the Triassic, Trias the Triassic period or rock system
[C19: from Latin trias triad, with reference to the three subdivisions]

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

1841, from Ger., coined 1841 by Ger. geologist Friedrich August von Alberti (1795-1878), from Gk. trias "triad," because it is divisible (in Germany) into three groups.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Triassic   (trī-ās'ĭk)  Pronunciation Key 
The earliest period of the Mesozoic Era, from about 245 to 208 million years ago. During the early part of the Triassic Period the supercontinent Pangaea was located along the equator; by the end of the Triassic it had started to split up. Land life diversified in the Triassic in response to the mass extinctions of the end of the Paleozoic. Conifers, cycads, marine reptiles, dinosaurs, and the earliest mammals first appeared. See Chart at geologic time.
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