‖n.; pl. Tonneaux /plu>. [ F. ] 1. In France, a light-wheeled vehicle with square or rounded body and rear entrance. [ Webster 1913 Suppl. ]

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. [ Webster 1913 Suppl. ]

3. same as Tonne. [ Webster 1913 Suppl. ]