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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 a person or thing that is outdated or has become obsolete because of failure to adapt to changing circumstances.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.
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.
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.
Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is a subject of active research.
Oct 27, 2009 · Lia Toby/Getty Images. The prehistoric reptiles known as dinosaurs arose during the Middle to Late Triassic Period of the Mesozoic Era, some 230 million years ago. They were members of a subclass...
