Geologic period that occurred roughly 208 to 245 million years ago. During this period, the first dinosaurs appeared.

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" [..]

a period of geologic time lasting from 245m to 208m years ago.

The Triassic period occurred 248 to 213 million years ago. It was the earliest period of the Mesozoic Era when the first mammals emerged and dinosaurs were numerous.

a geological period from 225 to 195 million years ago. See time table.

(n) from 230 million to 190 million years ago; dinosaurs, marine reptiles; volcanic activity(adj) of or relating to or denoting the first period of the Mesozoic era

A Period from 251 to 200 million years ago divided into three epochs: The

period of geological time from 250 to 205.1 million years ago. Marks the beginning of the Mesozoic Era

trahy-as-ik Period of geological time about 248 - 213 million years ago.

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. * '''1990''', Michael Crichton, [..]