- Jurassic⇄adj. of or having to do with this period or its rocks.
- Jurassic⇄Jurassic, noun, adjective.
- Jurassic⇄noun 1. the middle geological period of the Mesozoic era, after the Triassic and before the Cretaceous, when dinosaurs dominated the earth and birds first appeared.
2. the rocks formed in this period.