WordNet (r) 3.0 (2006):

St. Louis
    n 1: the largest city in Missouri; a busy river port on the
         Mississippi River near its confluence with the Missouri
         River; was an important staging area for wagon trains
         westward in the 19th century [syn: Saint Louis, St.
         Louis, Gateway to the West]
    2: king of France and son of Louis VIII; he led two unsuccessful
       Crusades; considered an ideal medieval king (1214-1270) [syn:
       Louis IX, Saint Louis, St. Louis]