Definition of "Triassic"

Triassic

/tɹaɪˈæsɪk/

adjective
not comparable
1. 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.
  Quotations
  “Well,” Ellie said. “We know animals have survived. Crocodiles are basically Triassic animals living in the present. Sharks are Triassic. So we know it has happened before.”
  1990, Michael Crichton, Jurassic Park, Alfred A. Knopf, page 45
proper noun
1. (geology) A geologic period within the Mesozoic era, comprising lower, middle and upper epochs from about 250 to 200 million years ago.