Bual
(or Boal) is a variety of grape used in the production
of medium-rich fortified wines from Madeira Island.
According to the Geisenheim DNA Database, the
name is a synonym for each of at least four white
wine-producing varieties.
The
name can be applied to any one of several varieties
including Codega, Dõna Branco, Rabigato,
or Sémillon.
The
vines are also common in Portugal and Spain, where
the fruit is used in the same way for fortified
wines.
It
gives its name to one of the types of Madeira
wine.
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