Definition of Triassic in English:



  • 1Relating to or denoting the earliest period of the Mesozoic era, between the Permian and Jurassic periods.

    • ‘In the Mesozoic section, a Triassic basin, up to 1800 m thick and roughly circular in map view, is centred SW of the present uplifted Bishri block.’
    • ‘Permian and Triassic plutonic complexes comprise monzonite, granite, granodiorite or tonalite with minor gabbro and diorite.’
    • ‘Implicit in this emplacement model is that the Permian and Triassic plutonic complexes are tabular granites with length and width dimensions that are much greater than their thickness.’
    • ‘Low-angle unconformities can be observed between the Triassic and Jurassic rocks at outcrop scale.’
    • ‘Uppermost Permian and Triassic terrestrial sediments conformably overlie the terminal volcanic rocks.’
    1. 1.1The Triassic period or the system of rocks deposited during it.
      • ‘Such sites are found in numerous strata of different ages throughout the triassic, jurassic and cretaceous, all of which were allegedly laid down during the flood.’


Mid 19th century: from late Latin trias (see triad), because the strata are divisible into three groups, + -ic.