Source : Webster's Revised Unabridged Dictionary (1913)

Lombard \Lom"bard\, n. [F. lombard, fr. the Longobardi or
   Langobardi, i. e., Longbeards, a people of Northern Germany,
   west of the Elbe, and afterward in Northern Italy. See
   {Long}, and {Beard}, and cf. {Lumber}.]
   1. A native or inhabitant of Lombardy.

   2. A money lender or banker; -- so called because the
      business of banking was first carried on in London by
      Lombards.

   3. Same as {Lombard-house}.

            A Lombard unto this day signifying a bank for usury
            or pawns.                             --Fuller.

   4. (Mil.) A form of cannon formerly in use. --Prescott.

   {Lombard Street}, the principal street in London for banks
      and the offices of note brokers; hence, the money market
      and interest of London.

Source : WordNet®

Lombard Street
     n : a street in central London containing many of the major
         London banks