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type of grape vine used in wine-making, 1912, American English variant spelling of French pineau (attested in English from 1763), name of a family of wine grapes, from pin "pine tree" (see pine (n.)) + diminutive suffix -eau. So called from the shape of the grape clusters. Variants are pinot noir, "black," pinot blanc, "white," and pinot gris, "gray."