noun. 1  a. Political division of an area into partially autonomous regions. 2  Loyalty to the interests of a particular region. 3  A feature, such as an expression, a pronunciation, or a custom, that is characteristic of a geographic area.  The use of regional characteristics, as of locale, custom, or speech, in literature or art.
The number of teeth dinosaurs had varied dramatically, depending on the type of dinosaur. Some dinosaurs, like Ornithomimus and Gallimimus, did not have teeth. On the other end of the spectrum, Tyrannosaurus rex had 50 to 60 solid cone-shaped teeth as big as bananas. Hadrosaurs, or duck-billed dinosaurs, had the most teeth: up to 960 cheek teeth! Dinosaur teeth were replaceable. If a dinosaur broke or lost a tooth, another grew in to take the place, behaving much like sharks teeth do today.
Argentinosaurus, known as a sauropod, lived during the middle cretaceous period, 100-90 million years ago. Though it has fewer fragments available, A. fragillimus â a dino in the Amphicoelias family â might be the biggest dinosaur on the block. Based on surviving descriptions of a single fossil bone, researchers estimate that fragillimus may have been 130 to 200 feet long, and may have had a mass of up to 135 tons.