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[trahy-as-ik] /traɪˈæs ɪk/ 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.
Also, Trias
[trahy-uh s] /ˈtraɪ əs/ (Show IPA)
. the Triassic Period or System.
Origin of Triassic
1835-45; Trias the three-part series of strata characterizing the period (< German < Greek triás; see triad) + -ic
Related forms
post-Triassic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for Triassic


of, denoting, or formed in the first period of the Mesozoic era that lasted for 42 million years and during which reptiles flourished
the Triassic, Trias, the Triassic period or rock system
Word Origin
C19: from Latin trias triad, with reference to the three subdivisions
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 Triassic

1841, from German, coined 1841 by German geologist Friedrich August von Alberti (1795-1878), from Greek trias "triad" (see triad), because it is divisible (in Germany) into three groups.

Online Etymology Dictionary, © 2010 Douglas Harper
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Triassic in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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