Etymology
The word "dinosaur" is derived from two Ancient Greek words:
Meaning and Origin
The term "dinosaur" was first coined in 1842 by the English paleontologist Sir Richard Owen. Owen used the word to refer to a group of extinct reptiles that had previously been classified as "antediluvian lizards" (i.e., lizards that lived before the biblical Deluge).
Owen's definition of dinosaurs was based on the discovery of a collection of fossil bones from different parts of England. He recognized that these bones belonged to a group of reptiles that were distinct from both living lizards and known fossil reptiles. He proposed the term "dinosaur" to highlight the impressive size and fearsome nature of these creatures.
Over time, the definition of dinosaurs has been refined and expanded. Today, dinosaurs are generally considered to be a diverse group of reptiles that lived during the Mesozoic Era (252-66 million years ago). Dinosaurs include birds, which are the only surviving dinosaur group, as well as a wide range of extinct groups, such as:
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