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A walnut is the edible seed of a drupe, and thus not a true botanical nut. It is commonly consumed as a nut. After full ripening for its edible seed when the shell has been discarded, it is used as a garnish or a snack. Nuts of the eastern black walnut (Juglans nigra) and butternuts (Juglans cinerea) are less commonly consumed.
From Middle English walnote, walnutte, walnotte, walnote, from Old English wealhhnutu (“walnut”, literally “foreign nut”), from Proto-Germanic *walhaz (“foreigner”) + *hnuts (“nut”). Cognate with Dutch walnoot, German Walnuss, Swedish valnöt, Icelandic valhneta. Compare more recent term Welsh onion, which...