The Collaborative International Dictionary of English v.0.48:
Car \Car\, n. [OF. car, char, F. cahr, fr. L. carrus, Wagon: a
Celtic word; cf. W. car, Armor. karr, Ir. & Gael. carr. cf.
1. A small vehicle moved on wheels; usually, one having but
two wheels and drawn by one horse; a cart.
2. A vehicle adapted to the rails of a railroad. [U. S.]
Note: In England a railroad passenger car is called a railway
carriage; a freight car a goods wagon; a platform car a
goods truck; a baggage car a van. But styles of car
introduced into England from America are called cars;
as, tram car. Pullman car. See Train.
3. A chariot of war or of triumph; a vehicle of splendor,
dignity, or solemnity. [Poetic].
The gilded car of day. --Milton.
The towering car, the sable steeds. --Tennyson.
4. (Astron.) The stars also called Charles's Wain, the Great
Bear, or the Dipper.
The Pleiads, Hyads, and the Northern Car. --Dryden.
5. The cage of a lift or elevator.
6. The basket, box, or cage suspended from a balloon to
contain passengers, ballast, etc.
7. A floating perforated box for living fish. [U. S.]
Car coupling, or Car coupler, a shackle or other device
for connecting the cars in a railway train. [U. S.]
Dummy car (Railroad), a car containing its own steam power
Freight car (Railrood), a car for the transportation of
merchandise or other goods. [U. S.]
Hand car (Railroad), a small car propelled by hand, used by
railroad laborers, etc. [U. S.]
Horse car, or Street car, an omnibus car, draw by horses
or other power upon rails laid in the streets. [U. S.]
Palace car, Drawing-room car, Sleeping car, Parlor
car, etc. (Railroad), cars especially designed and furnished
for the comfort of travelers.