[W/K] :: Madeira nuts

  Walnut \Wal"nut\, n. [OE. walnot, AS. wealh-hnutu a Welsh or
     foreign nut, a walnut; wealh foreign, strange, n., a
     Welshman, Celt (akin to OHG. Walh, properly, a Celt, from the
     name of a Celtic tribe, in L. Volcae) + hnutu a nut; akin to
     D. walnoot, G. walnuss, Icel. valhnot, Sw. valn["o]t, Dan
     valn["o]d. See Nut, and cf. Welsh.] (Bot.)
     The fruit or nut of any tree of the genus Juglans; also,
     the tree, and its timber. The seven or eight known species
     are all natives of the north temperate zone.
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     Note: In some parts of America, especially in New England,
           the name walnut is given to several species of hickory
           ({Carya), and their fruit.
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     Ash-leaved walnut, a tree ({Juglans fraxinifolia), native
        in Transcaucasia.
  
     Black walnut, a North American tree ({Juglans nigra)
        valuable for its purplish brown wood, which is extensively
        used in cabinetwork and for gunstocks. The nuts are
        thick-shelled, and nearly globular.
  
     English walnut, or European walnut, a tree ({Juglans
        regia), native of Asia from the Caucasus to Japan,
        valuable for its timber and for its excellent nuts, which
        are also called Madeira nuts.
  
     Walnut brown, a deep warm brown color, like that of the
        heartwood of the black walnut.
  
     Walnut oil, oil extracted from walnut meats. It is used in
        cooking, making soap, etc.
  
     White walnut, a North American tree ({Juglans cinerea),
        bearing long, oval, thick-shelled, oily nuts, commonly
        called butternuts. See Butternut.
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