Source : Webster's Revised Unabridged Dictionary (1913)

Hansom \Han"som\, n., Hansom cab \Han"som cab`\ [From the name
   of the inventor.]
   A light, low, two-wheeled covered carriage with the driver's
   seat elevated behind, the reins being passed over the top.

         He hailed a cruising hansom . . . `` 'Tis the gondola
         of London,'' said Lothair.               --Beaconsfield.

Source : WordNet®

hansom
     n : a two-wheeled horse-drawn covered carriage with the driver's
         seat above and behind the passengers [syn: {hansom cab}]