From WordNet (r) 2.0 (August 2003) [wn]:
hansom
n : a two-wheeled horse-drawn covered carriage with the driver's
seat above and behind the passengers [syn: hansom cab]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Hansom \Han"som\ (h[a^]n"s[u^]m), n., Hansom cab \Han"som cab`\
(k[a^]b`). [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.
[1913 Webster]
He hailed a cruising hansom . . . " 'Tis the gondola of
London," said Lothair. --Beaconsfield.
[1913 Webster]