WordNet (r) 3.0 (2006):

Baron Munchausen
    n 1: German raconteur who told preposterous stories about his
         adventures as a soldier and hunter; his name is now
         associated with any telling of exaggerated stories or
         winning lies (1720-1797) [syn: Munchhausen, Karl
         Friedrich Hieronymus von Munchhausen, Munchausen, Baron
         Munchausen]