Ton`neau" (?), n.; pl. Tonneaux (#). [F.]
In France, a light-wheeled vehicle with square or rounded body and rear entrance.
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