Triassic

[ trahy-as-ik ]

/ traɪˈæs ɪk /

Geology

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adjective

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

Also Tri·as

[trahy-uhs] /ˈtraɪ əs/ the Triassic Period or System.

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Origin of Triassic

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

OTHER WORDS FROM Triassic

post-Tri·as·sic, adjective

Words nearby Triassic

triannual, triapsidal, triarchy, triaryl, triarylmethane dye, Triassic, triathlete, triathlon, triatic stay, Triatoma, triatomic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use Triassic in a sentence

The Triassic flora is essentially similar to that of the higher Permian strata, though many of the genera are different.
The Principles of Stratigraphical Geology|J. E. Marr
Desert conditions, with confined inland seas, marked the Permian and Triassic periods.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 4|Various
Triassic plain from the south coast at the mouth of the Exe to the east coast at the mouth of the Tees.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 4|Various
In Britain they contain very few fossils, but these are more abundant in the Triassic deposits of foreign countries.
Geology|James Geikie

On these lands of the Triassic time the air-breathing life made very rapid advances.
Young Folks' Library, Volume XI (of 20)|Various

British Dictionary definitions for Triassic

Triassic

/ (traɪˈæsɪk) /

adjective

of, denoting, or formed in the first period of the Mesozoic era that lasted for 42 million years and during which reptiles flourished

noun

the Triassic or Trias the Triassic period or rock system

Word Origin for Triassic

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

Scientific definitions for Triassic

Triassic

[ trī-ăs′ĭk ]

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.