Definition of tonneau in English:

tonneau

noun ˈtɒnəʊ

1The part of a car, typically an open car, occupied by the back seats.
（汽车，尤指敞篷车的）后部座位部分
I sat rigidly in the tonneau of an asthmatic 1956 Chevrolet
1. 1.1
  short for tonneau cover
  Example sentencesExamples
  The only thing that has developed over the months is an irritating squeak from the rear interior; we think it may be from the tonneau but we have failed to pin it down so far.
  Composite inserts at the forward edge of the tonneau hide the mechanicals when the top is down.
  But I do suspect that it is the tonneau that is causing the rattling noise I am experiencing while on the move!
  It clicks into place when folded, and the front part of the roof forms a flat cover so there's no need for a fiddly separate tonneau.
  Among the application areas that he thinks the process can be used for include exterior body panels of a wide assortment: vehicle hard tops, hard tonneaus, recreational vehicle and heavy truck sidewalls, and the like.
  Lift the top approximately 8 in., press the button on the center console and the hard tonneau opens up.
  The luggage bay is covered by a retractable tonneau, and optional cargo nets prevent smaller objects from being battered during spirited cornering.
2A unit of capacity for French wine, especially Bordeaux, usually equal to 900 litres or 198 gallons.
法国酒容量单位（尤指波尔多酒的容量单位，一般等于900升，或198加仑）

Origin

Late 18th century (in sense 2): French, literally 'cask, tun'.

Definition of tonneau in US English:

tonneau

noun

1The part of an automobile, typically an open car, occupied by the back seats.
（汽车，尤指敞篷车的）后部座位部分
1. 1.1
  short for tonneau cover
  Example sentencesExamples
  But I do suspect that it is the tonneau that is causing the rattling noise I am experiencing while on the move!
  Among the application areas that he thinks the process can be used for include exterior body panels of a wide assortment: vehicle hard tops, hard tonneaus, recreational vehicle and heavy truck sidewalls, and the like.
  Lift the top approximately 8 in., press the button on the center console and the hard tonneau opens up.
  The luggage bay is covered by a retractable tonneau, and optional cargo nets prevent smaller objects from being battered during spirited cornering.
  The only thing that has developed over the months is an irritating squeak from the rear interior; we think it may be from the tonneau but we have failed to pin it down so far.
  Composite inserts at the forward edge of the tonneau hide the mechanicals when the top is down.
  It clicks into place when folded, and the front part of the roof forms a flat cover so there's no need for a fiddly separate tonneau.

Origin

Late 18th century (in tonneau (sense 2 of the noun)): French, literally ‘cask, tun’.

词汇	tonneau
释义	Definition of tonneau in English: tonneau noun ˈtɒnəʊ 1The part of a car, typically an open car, occupied by the back seats. （汽车，尤指敞篷车的）后部座位部分 I sat rigidly in the tonneau of an asthmatic 1956 Chevrolet 1.1 short for tonneau cover Example sentencesExamples The only thing that has developed over the months is an irritating squeak from the rear interior; we think it may be from the tonneau but we have failed to pin it down so far. Composite inserts at the forward edge of the tonneau hide the mechanicals when the top is down. But I do suspect that it is the tonneau that is causing the rattling noise I am experiencing while on the move! It clicks into place when folded, and the front part of the roof forms a flat cover so there's no need for a fiddly separate tonneau. Among the application areas that he thinks the process can be used for include exterior body panels of a wide assortment: vehicle hard tops, hard tonneaus, recreational vehicle and heavy truck sidewalls, and the like. Lift the top approximately 8 in., press the button on the center console and the hard tonneau opens up. The luggage bay is covered by a retractable tonneau, and optional cargo nets prevent smaller objects from being battered during spirited cornering. 2A unit of capacity for French wine, especially Bordeaux, usually equal to 900 litres or 198 gallons. 法国酒容量单位（尤指波尔多酒的容量单位，一般等于900升，或198加仑） Origin Late 18th century (in sense 2): French, literally 'cask, tun'. Definition of tonneau in US English: tonneau noun 1The part of an automobile, typically an open car, occupied by the back seats. （汽车，尤指敞篷车的）后部座位部分 1.1 short for tonneau cover Example sentencesExamples But I do suspect that it is the tonneau that is causing the rattling noise I am experiencing while on the move! Among the application areas that he thinks the process can be used for include exterior body panels of a wide assortment: vehicle hard tops, hard tonneaus, recreational vehicle and heavy truck sidewalls, and the like. Lift the top approximately 8 in., press the button on the center console and the hard tonneau opens up. The luggage bay is covered by a retractable tonneau, and optional cargo nets prevent smaller objects from being battered during spirited cornering. The only thing that has developed over the months is an irritating squeak from the rear interior; we think it may be from the tonneau but we have failed to pin it down so far. Composite inserts at the forward edge of the tonneau hide the mechanicals when the top is down. It clicks into place when folded, and the front part of the roof forms a flat cover so there's no need for a fiddly separate tonneau. Origin Late 18th century (in tonneau (sense 2 of the noun)): French, literally ‘cask, tun’.
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