8 letters · 10 points in Scrabble
noun from 230 million to 190 million years ago; dinosaurs, marine reptiles; volcanic activity
adjective of or relating to or denoting the first period of the Mesozoic era
originFrom Trias (“three-layered geologic strata between the Permian and Jurassic”) < German Trias < Ancient Greek τριάς (triás, “triad”), + -ic. Coined in 1841 by geologist Friedrich August von Alberti (1795–1878).
Etymology from Wiktionary, CC BY-SA 3.0