of, denoting, or formed in the first period of the Mesozoic era that lasted for 42 million years and during which reptiles flourished
noun
2. the Triassic
Word origin
C19: from Latin trias triad, with reference to the three subdivisions
Triassic in American English
(traɪˈæsɪk)
adjective
[sometimest-]
designating or of the first geologic period of the Mesozoic Era, characterized by the breakupof Pangea, the development of tall forests of cycads and conifers, and the presence of the first dinosaurs, turtles, frogs, and small mammals
Idioms:
the Triassic
Word origin
< Ger triassisch (< LL Trias (see triad: because divisible into three groups) + -isch, -ic