1.) The term means "terrible lizard", derived from Greek words. Extremely successful creatures who are believed to have died out 65 million years ago and lived/ruled during the Mesozoic era. Some (meaning the theropods) are also believed to be the ancestors of modern-day birds due to feather imprints around fossils and other similarities, with the closest links being the dromaeosaurs (raptors); however, none seem to have been able to actually fly.

There were a number of different groups, but they are generally classified by whether they were herbivorous or carnivorous, which is also also by the structure of their hip bones (bird- or lizard-hipped). Some, if not all, might have even been warm-blooded. They were also the descendants of reptiles, not the other way around. And contrary to popular belief, most were not ridiculously huge. Most were were about the size of a large car or smaller.

Although it seems like we've dug up every dinosaur that ever lived in the world, in truth it is only a small percentage, so we'll never actually really know that much about them. Oh, and don't forget that thanks to World War II, the first fossils of Carcharodontosaurus and Spinosaurus were destroyed.

2.) Something old or outdated; obsolete. May also pertain to the description of an older person.
When the fossils of a dinosaur called Megalosaurus were found in 1677, people thought it was a dragon.
by Copycat26 August 12, 2011
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Extinct creature that used to terrorize the prehistoric land, and now terrorize the hearts of modern people.
The ride became more frightening with the appearance of the dinosaur.
by the mummy October 31, 2009
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To describe something that is good, or cool.
That was fucking dinosaur, like.

Sky's lawyers are fucking dinosaur!
by Andy_Gray January 27, 2011
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Obs. A turniqutte usually of rubber tightend around the bicep during the preparation of injecting a sirenge containing illicit drugs, i.e heroin.
I was such a waste, I had to have help tying on the dinosaur.
by Anonymous July 17, 2003
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I sincerely hope Phrigajiblenophip's definition was a joke.

See my definition of 'Dinosaur' and ByThorsBeard's definition of 'Scale of Dinosaurs'.
Alarmingly, a recent poll showed that 51% of Americans believe that dinosaurs and early man lived at the same time.
by Killing Kittens October 26, 2004
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