Hollow measure or barrel type used in the French Médoc with a volume of 450 litres, which corresponds to two barriques of 225 litres each. Two douils make a tonneau with 900 litres. See also under barrel types and hollow measures.
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The glossary is a monumental achievement and one of the most important contributions to wine knowledge. Of all the encyclopaedias I use on the subject of wine, it is by far the most important. That was the case ten years ago and it hasn't changed since.
Andreas Essl
Autor, Modena