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Trias

 - 2 dictionary results

Tri⋅as⋅sic

[trahy-as-ik] Geology
–adjective
1. 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.
–noun
2. Also, Tri⋅as [trahy-uhs] the Triassic Period or System.

Origin:
1835–45; Trias the three-part series of strata characterizing the period (< G < Gk triás; see triad ) + -ic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

Triassic 
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, © 2001 Douglas Harper
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