noun.
A large four-wheeled Russian vehicle, with a boat-shaped body fixed to two parallel longitudinal wooden bars, in place of springs, and a leather top or hood. It is commonly without seats, and is drawn by three horses.
the GNU version of the Collaborative International Dictionary of English
noun.
A low four-wheeled carriage used in Russia. The carriage box rests on two long, springy poles which run from the fore to the hind axletree. When snow falls, the wheels are taken off, and the body is mounted on a sledge.