In Jura, one word to look out for is ouillé.
When you age wine in a barrel, some of the wine evaporates. As it does, and oxygen gets into the barrel, the flavour of the wine changes. These flavours in small doses are often enjoyable and can be characteristics in many great aged wines.
However, the term ouillé means that the barrels get topped up with new wine to reduce the amount of oxygen in the barrel. In Jura, they will label ouillé if it has been topped up. Both are topped up and non- give distinctive and fascinating wines. Ouillé is considered by some to be savagnin - the main grape from Jura - to be savagnin in its purest form.