hadrian
— Noun
– English
~ Roman Emperor who was the adoptive son of Trajan; travelled throughout his empire to strengthen its frontiers and encourage learning and architecture; on a visit to Britain in 122 he ordered the construction of Hadrian's Wall (76-138)
hadron
— Noun
– English
~ any elementary particle that interacts strongly with other particles
hadrosaur
— Noun
– English
~ any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
hadrosauridae
— Noun
– English
~ duck-billed dinosaurs; upper Cretaceous
hadrosaurus
— Noun
– English
~ any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic