Jurassic

2 definitions found

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

  Jurassic \Ju*ras"sic\, a. (Geol.)
     Of the age of the middle Mesozoic, about 190 to 140 million
     years ago, including, as divided in England and Europe, the
     Lias, O["o]lite, and Wealden; -- named from certain rocks of
     the Jura mountains. It was noted for the predominance of
     dinosaurs on land, and the development of the first birds and


     mammals. -- n. The Jurassic period or formation; -- called
     also the {Jura}.
     [1913 Webster +PJC]

From WordNet (r) 2.0 [wn]:

  Jurassic
       n : from 190 million to 135 million years ago; dinosaurs;
           conifers [syn: {Jurassic period}]