1. (noun) 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)

• hadrian
• publius aelius hadrianus

2. (noun) English physiologist who conducted research into the function of neurons; 1st baron of Cambridge (1889-1997)

• baron adrian
• edgar douglas adrian