tonneau
/ˈtɒnəʊ/noun
1
- the part of a motor car, 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.TONNEAU COVER的简称。
2
- a unit of capacity for French wine, especially Bordeaux, usually equally 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）。
词源
late 18th cent. (in sense 2)： French, literally 'cask, tun'.