
1) Automobile term 2) Automobile related term 3) Automobile word 4) Car cover 5) Cover for a truck bed 6) French word used in English
Found on
https://www.crosswordclues.com/clue/tonneau

Tonneau cover (oʊ or oʊ) describes a hard or soft cover used to protect unoccupied passenger seats in a convertible or roadster, or the cargo bed in a pickup truck. Hard tonneau covers open by a hinging or folding mechanism while soft covers open by rolling up. The tonneau cover is used to conceal cargo. When the cover is pulled out, it keeps it...
Found on
http://en.wikipedia.org/wiki/Tonneau

rear extension of body of car
Found on
http://phrontistery.info/t.html

• (n.) In France, a light-wheeled vehicle with square or rounded body and rear entrance. • (n.) 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....
Found on
http://thinkexist.com/dictionary/meaning/tonneau/

A historical standard of measure for wine in Bordeaux, the tonneau is equal to four standard barrels, or exactly 100 cases of wine at twelve 750 ml bottles each. The term is also used to mean an oversize barrel of unspecific size, since no actual container the size of four standard barrels and called a tonneau exists.
Found on
http://www.edenwines.co.uk/Glossary_t.html
Ton`neau' noun ; plural
Tonneaux . [ French]
1. In France, a light-wheeled vehicle with square or rounded body and rear entrance.
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 th...
Found on
http://www.encyclo.co.uk/webster/T/68

A watch with a barrel shaped case that has two convex sides
Found on
http://www.saffronart.com/sitepages/jewelry/glossary.aspx
No exact match found.