Etymology
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Triassic (adj.)

1841, from German, coined 1841 by German geologist Friedrich August von Alberti (1795-1878), from Trias "period preceding the Jurassic," from Greek trias "triad, the number three" (see triad). So called because it is divisible (in Germany) into three groups.

updated on February 16, 2014

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Definitions of Triassic from WordNet
1
Triassic (n.)
from 230 million to 190 million years ago; dinosaurs, marine reptiles; volcanic activity;
Synonyms: Triassic period
2
Triassic (adj.)
of or relating to or denoting the first period of the Mesozoic era;
From wordnet.princeton.edu, not affiliated with etymonline.