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- DictionaryDi·no·saur/ˈdīnəˌsôr/
noun
- 1. a fossil reptile of the Mesozoic era, in many species reaching an enormous size.
- 2. a person or thing that is outdated or has become obsolete because of failure to adapt to changing circumstances.
Dinosaur definition: any chiefly terrestrial, herbivorous or carnivorous reptile of the extinct orders Saurischia and Ornithischia, from the Mesozoic Era, certain species of which are the largest known land animals.. See examples of DINOSAUR used in a sentence.
Dec 8, 2017 · SCIENCE. Ask Smithsonian. What Makes a Dinosaur a Dinosaur? The question may sound like a “duh,” but it gets to the heart of how we categorize and define nature. Riley Black. Science...
DINOSAUR definition: 1. a type of reptile that became extinct about 65,000,000 years ago. There were many different…. Learn more.
noun. /ˈdaɪnəsɔː (r)/ /ˈdaɪnəsɔːr/ a reptile that lived millions of years ago but is now extinct (= it no longer exists). There were many types of dinosaur, some of which were very large. Modern scientists now consider that birds, which evolved (= developed) from dinosaurs, belong to the same group and can be called avian dinosaurs.
Dinosaurs are a group of reptiles that dominated the land for over 140 million years (more than 160 million years in some parts of the world). They evolved diverse shapes and sizes, from the fearsome giant Spinosaurus to the chicken-sized Microraptor, and were able to survive in a variety of ecosystems.
DINOSAUR | meaning - Cambridge Learner's Dictionary. Meaning of dinosaur – Learner’s Dictionary. dinosaur. noun [ C ] uk / ˈdaɪnəsɔː r/ us. Add to word list Add to word list. A2. a very large animal that used to live millions of years ago. (Definition of dinosaur from the Cambridge Learner's Dictionary © Cambridge University Press)
Dinosaurs. Dinosaur, the common name given to a group of reptiles, often very large, that first appeared roughly 245 million years ago (near the beginning of the Middle Triassic Epoch) and thrived worldwide for nearly 180 million years.
