The Collaborative International Dictionary of English v.0.48:

Adrian \A"dri*an\, a. [L. Hadrianus.]
   Pertaining to the Adriatic Sea; as, Adrian billows.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Adrian
    n 1: 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) [syn: Hadrian, Publius Aelius Hadrianus,
         Adrian]
    2: English physiologist who conducted research into the function
       of neurons; 1st baron of Cambridge (1889-1997) [syn:
       Adrian, Edgar Douglas Adrian, Baron Adrian]