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The Nebbiolo (Italian), or Nebieul (Piedmontese) is one of the most important wine grape varieties of Italy's Piedmont region.

The grape is thought to derive its name from the Piedmontese word nebbia which means "fog." During harvest, generally in late October, a deep, intense fog sets into the Langhe region, where Nebieul thrives. An alternative (and maybe closer to truth) traditional explanation refers to the white milky veil that forms over the fruits as they reach maturity.