Abstract
The term "Dinosauria" was first used in 1841 by Sir Richard Owen in an address to the British Association for the Advancement of Science, subsequently publishing the term in 1842. He was the first to recognize that dinosaurs ("fearfully great reptiles") were a distinct group of reptiles, much different from today's lizards. Owen defined dinosaurs as reptiles that walked erect, having a posture similar to elephants and rhinos. Dinosaurs did not have wings, flippers, or fins. Owen was the best known and most authoritative comparative anatomist in the nineteenth century. He argued extensively against Darwin's theory of evolution later in his life.