The Collaborative International Dictionary of English v.0.48:

London \Lon"don\, n.
   The capital city of England.
   [1913 Webster]

   London paste (Med.), a paste made of caustic soda and
      unslacked lime; -- used as a caustic to destroy tumors and
      other morbid enlargements.

   London pride. (Bot.)
   (a) A garden name for Saxifraga umbrosa, a hardy perennial
       herbaceous plant, a native of high lands in Great
       Britain.
   (b) A name anciently given to the Sweet William. --Dr. Prior.

   London rocket (Bot.), a cruciferous plant (Sisymbrium
      Irio) which sprung up in London abundantly on the ruins
      of the great fire of 1667.
      [1913 Webster]

WordNet (r) 3.0 (2006):

London
    n 1: the capital and largest city of England; located on the
         Thames in southeastern England; financial and industrial
         and cultural center [syn: London, Greater London,
         British capital, capital of the United Kingdom]
    2: United States writer of novels based on experiences in the
       Klondike gold rush (1876-1916) [syn: London, Jack London,
       John Griffith Chaney]