Designation (also pure variety) for a wine that has been pressed 100% from a single grape variety. If other grape varieties are also involved (even if only to a minor extent), it is not strictly speaking possible to speak of "single-varietal", although the term "single-varietal" is also used colloquially for a clearly dominant grape variety. However, the term is not regulated by wine law. Within the EU, however, there is a wine law regulation for the naming of grape varieties on the label. If a single grape variety is stated on the label, its share must be at least 85% (USA or Australia only 75%). The remaining 15% can be supplemented by other varieties, but do not appear on the label.
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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