Main Entry: Tri·as·sic

Pronunciation: \trī-ˈa-sik\

Function: adjective

Etymology: International Scientific Vocabulary, from Latin trias triad; from the three subdivisions of the European Triassic — more at triad

Date: 1841

: of, relating to, or being the earliest period of the Mesozoic era or the corresponding system of rocks marked by the first appearance of the dinosaurs — see geologic time table

— Triassic noun