Tonneau

n. pl. Tonneaux (#)

1. In France, a light-wheeled vehicle with square or rounded body and rear entrance.
2. (Automobiles) Orig., the after part of the body with entrance at the rear (as in vehicle in def. 1); now, one with sides closing in the seat or seats and entered by a door usually at the side, also, the entire body of an automobile having such an after part.
3. same as Tonne.