Triassic

adjective

Tri·​as·​sic trī-ˈa-sik 

: 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

Word History

Etymology

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

First Known Use

1841, in the meaning defined above

Kids Definition

Triassic

adjective

Tri·​as·​sic trī-ˈas-ik 

: of, relating to, or being the earliest period of the Mesozoic era of geological history marked by the first appearance of dinosaurs

also : relating to the corresponding system of rocks see geologic time

Triassic noun