Trias

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Trias \Tri"as\, n. [L., triad. See {Triad}.] (Geol.)
     The formation situated between the Permian and Lias, and so
     named by the Germans, because consisting of three series of
     strata, which are called in German the Bunter sandstein,
     Muschelkalk, and Keuper.
     [1913 Webster]