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.
The family contains some of the smallest known ornithischians â the North American Fruitadens, for example, reached a length of only 65 to 75 cm. Heterodontosaurus was amongst the largest known members of its family, reaching a length of between 1 to 1.75 m and weighing 1.8 or 10 kg.Only the South African Lycorhinus might have been larger. The skull was robustly built and triangular in side view. The front of the jaws where covered by a toothless horny beak.nother feature is the specialization of teeth which gave rise to the animal's name. Most dinosaurs (and indeed most reptiles) have a single type of tooth in their jaws, while Heterodontosaurus had three. At the front of the jaw beside the beak were small teeth likely used for chopping off leaves and stems.