Definition of Triassic
: 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
Origin and Etymology of triassic
International Scientific Vocabulary, from Latin trias triad; from the three subdivisions of the European Triassic — more at triad
First Known Use: 1841
Learn More about triassic
Seen and Heard
What made you want to look up Triassic? Please tell us where you read or heard it (including the quote, if possible).