1.1 short for tonneau cover.
- Lift the top approximately 8 in., press the button on the center console and the hard tonneau opens up.
- 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.
- Composite inserts at the forward edge of the tonneau hide the mechanicals when the top is down.
Late 18th century (in sense 2): French, literally 'cask, tun'.
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