Source : Webster's Revised Unabridged Dictionary (1913)

Brougham \Brough"am\, n.
   A light, close carriage, with seats inside for two or four,
   and the fore wheels so arranged as to turn short.

Source : WordNet®

brougham
     n 1: light carriage; pulled by a single horse
     2: a sedan that has no roof over the driver's seat