WordNet (r) 3.0 (2006):

Arthur
    n 1: elected vice president and became 21st President of the
         United States when Garfield was assassinated (1830-1886)
         [syn: Arthur, Chester A. Arthur, Chester Alan Arthur,
         President Arthur]
    2: a legendary king of the Britons (possibly based on a
       historical figure in the 6th century but the story has been
       retold too many times to be sure); said to have led the
       Knights of the Round Table at Camelot [syn: Arthur, King
       Arthur]