Labels:text | screenshot OCR: femur, noun. The thighbone. The hind leg bone that attaches to the hip joint. flood plain, noun. A low-lying area alongside a river made of soil deposited by floods. frill, noun. A bony collar commonly seen on ceratopsian dinosaurs (such as Triceratops) that may have served to regulate the animal's body temperature and as protection against predators, and as a place of attachment for the powerful jaw muscles. geologist, noun. A scientist who studies the history of the earth and the processes that act upon it. hadrosaur, noun. A large dinosaur that featured a ducklike beak. Some hadrosaurs had bony crests of various shapes and sizes on their heads. Edmontosaurus was a non-crested hadrosaur. herbivore, noun. Any one of a large group of animals that feeds only on plants. impression, noun. A mark or image of an object made by pressure, such as the remains of a leaf preserved in rock.