• Of or from the geologic strata above the Permian and below the Jurassic; of or belonging to the period 250 to 200 million years ago when these strata were laid down.

Proper Noun


  • From Trias < German Trias < Ancient Greek τριάς, -ic. Coined in 1841 by geologist Friedrich August von Alberti (1795–1878).

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