Dinosaur Definition & Meaning - Merriam-Webster
The meaning of DINOSAUR is any of a group (Dinosauria) of extinct, often very large, carnivorous or herbivorous archosaurian reptiles that have the hind limbs extending directly beneath the body and include chiefly terrestrial, bipedal or quadrupedal ornithischians (such as ankylosaurs and stegosaurs) and saurischians (such as sauropods and ...
Dinosaur - Wikipedia
Dinosaurs are a diverse group of reptiles that include birds and their extinct relatives. They first appeared in the Triassic period and dominated the land for over 160 million years until the Cretaceous–Paleogene extinction event.
Dinosaur | Definition, Types, History, Names, & Facts | Britannica
5 天之前 · Learn about dinosaurs, the diverse group of reptiles that dominated Earth for millions of years and evolved into birds. Explore their origin, classification, extinction, fossil record, and more with Britannica.
What are dinosaurs? - Natural History Museum
Dinosaurs are a group of reptiles that dominated the land for over 140 million years. They had an upright stance, strong jaws and diverse shapes and sizes. Learn more about their features, evolution and extinction.
What Makes a Dinosaur a Dinosaur? | Smithsonian
2017年12月8日 · A dinosaur is a reptile that shares a common ancestor with birds and has some unique features in its hips. Learn how scientists define and categorize dinosaurs based on evolutionary history...
Dinosaurs ‑ Extinction, Timeline & Definition - HISTORY
2009年10月27日 · Learn about the prehistoric reptiles that ruled the Earth for millions of years, from their origin and diversity to their extinction and legacy. Find out how dinosaurs are related to birds, what...
DINOSAUR Definition & Meaning | Dictionary.com
A dinosaur is any extinct terrestrial reptile of the orders Saurischia and Ornithischia, many of which were of gigantic size and abundant in the Mesozoic era. Learn more about the origin, history, and examples of the word dinosaur from Dictionary.com.
What Are Dinosaurs? - ScienceAlert
Dinosaurs are a diverse group of mostly land-based animals that are related to today's reptiles and birds. In fact, while dinosaurs are commonly seen as extinct and known only by their fossils, paleontologists technically include modern birds as a surviving group of avian dinosaurs.
Dinosaurs - Education | National Geographic Society
Dinosaurs have long captured our imagination as reptilian creatures with menacing teeth, claws, spikes, and hammering, bony bulbs. They roamed Earth roughly 175 million years ago, and most were wiped out by an extinction event roughly 65 million years ago.
DINOSAUR | definition in the Cambridge English Dictionary
DINOSAUR meaning: 1. a type of reptile that became extinct about 65,000,000 years ago. There were many different…. Learn more.
Dinosaur Definition & Meaning - YourDictionary
noun. Any of various extinct, mostly land-dwelling, four-limbed saurischian or ornithischian reptiles of the Mesozoic Era, including some c. 30 m (98.4 ft) long: the flesh-eaters usually walked on their hind limbs, the plant-eaters on all fours. Webster's New World. Similar definitions. Any large, extinct reptile of the Paleozoic or Mesozoic eras.
What is a Dinosaur? - Natural History Museum
What is a Dinosaur? Dinosaurs were a specialized group of land reptiles that lived during the Mesozoic Era, also called the "Age of Dinosaurs". The Mesozoic was the period of time between 252 million and 66 million years ago.
Dinosaurs 101 - Education
2024年9月26日 · Scientists estimate over a thousand dinosaur species once roamed Earth. Learn which ones were the largest and the smallest, what dinosaurs ate and how they behaved, as well as surprising facts about their extinction.
The Experts' Scientific Definition of Dinosaurs - ThoughtCo
2019年8月2日 · Learn how experts distinguish dinosaurs from other reptiles based on anatomical features and evolutionary history. Find out the first true dinosaurs, the two main groups of dinosaurs, and the differences from marine and flying reptiles.
Dinosaurs Portal | Britannica
Learn about dinosaurs, the diverse group of reptiles that dominated Earth for millions of years. Explore their features, classification, extinction, and how some evolved into birds.
dinosaur noun - Definition, pictures, pronunciation and usage …
A dinosaur is an extinct reptile that lived millions of years ago. Learn how to pronounce, use and distinguish dinosaur from avian dinosaur and other related words.
Dinosaur Facts - American Museum of Natural History
Quick facts about dinosaurs for kids and grown-ups! Find out what dinosaurs ate, how they may have behaved, what they may have looked like, and more.
DINOSAUR definition and meaning | Collins English Dictionary
1.countable noun A2. Dinosaurs were large reptiles which lived in prehistoric times. 2.countable noun. If you refer to an organization as a dinosaur, you mean that it is large, inefficient, and out of date. [disapproval] ...industrial dinosaurs. More Synonyms of dinosaur. Collins COBUILD Advanced Learner’s Dictionary.
dinosaur | definition for kids | Wordsmyth Word Explorer …
Learn how to spell dinosaur and what it means in English. Find out the origin of the word from Greek and see examples of dinosaurs and their features.
Dinosaur - Definition, Meaning & Synonyms - Vocabulary.com
All are gone—at least in their original form, although it is thought they simply evolved into other, present-day animals. The word dinosaur is often used for someone who is old-fashioned or unable to adapt to modern times.