sedan

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A closed automobile having two or four doors and a front and rear seat.
• noun A portable enclosed chair for one person, having poles in the front and rear and carried by two other people.

from The Century Dictionary.

• noun A covered chair serving as a vehicle for carrying one person who sits within it, the inclosure being therefore of much greater height than width: it is borne on two poles, which pass through rings secured to the sides, and usually by two bearers.
• noun A hand-barrow with a deep basket-like bottom made of barrel-hoops, used to carry fish.

from the GNU version of the Collaborative International Dictionary of English.

• noun A portable chair or covered vehicle for carrying a single person, -- usually borne on poles by two men. Called also sedan chair.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An enclosed windowed chair suitable for a single occupant, carried by at least two porters, in equal numbers in front and behind, using wooden rails that passed through metal brackets on the sides of the chair.
• noun US, Australia, Canada, New Zealand A motorcar designed in a configuration with separate compartments for engine space, driver/passenger space and luggage space.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a car that is closed and that has front and rear seats and two or four doors
• noun a closed litter for one passenger