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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.

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Definitions of Triassic
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