tonneauPronunciation: /ˈtɒnəʊ/Definition of tonneau noun 1the part of a car, typically an open car, occupied by the back seats: I sat rigidly in the tonneau of an asthmatic 1956 Chevrolet short for tonneau cover. 2a unit of capacity for French wine, especially Bordeaux, usually equal to 900 litres or 198 gallons. Origin: late 18th century (in tonneau (sense 2)): French, literally 'cask, tun'tonneau in other Oxford dictionaries Definition of tonneau in the US English dictionary
