Pronunciation: (brOO'um, brOOm, brō'um),[key] —n. 1. a four-wheeled, boxlike, closed carriage for two or four persons, having the driver's perch outside.
2. Auto. a. (formerly) a limousine having an open driver's compartment.
b. an early type of automobile resembling a coupé, often powered by an electric motor.