edmontosaurus: duck-billed dinosaur from Canada found as a fossilized mummy with skin
hadrosaur: any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
oat cell carcinoma: highly malignant carcinoma composed of small round or egg-shaped cells with little cytoplasm; lung cancers are frequently oat cell carcinomas