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Definition of Jurassic
1. Noun. From 190 million to 135 million years ago; dinosaurs; conifers.
Exact synonyms: Jurassic Period
Group relationships: Age Of Reptiles, Mesozoic, Mesozoic Era
Generic synonyms: Geological Period, Period
Group relationships: Age Of Reptiles, Mesozoic, Mesozoic Era
Generic synonyms: Geological Period, Period
2. Adjective. Of or relating to or denoting the second period of the Mesozoic era.
Definition of Jurassic
1. a. Of the age of the middle Mesozoic, including, as divided in England and Europe, the Lias, Oölite, and Wealden; -- named from certain rocks of the Jura mountains.
Definition of Jurassic
1. of or pertaining to a certain geologic time period [adj]
Medical Definition of Jurassic
1.