The Collaborative International Dictionary of English v.0.48:

Juglandin \Jug"lan*din\, n. [L. juglans, -andis, a walnut: cf.
   F. juglandine.] (Chem.)
   An extractive matter contained in the juice of the green
   shucks of the walnut (Juglans regia). It is used
   medicinally as an alterative, and also as a black hair dye.
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The Collaborative International Dictionary of English v.0.48:

Juglandine \Jug"lan*dine\, n.
   An alkaloid found in the leaves of the walnut (Juglans
   regia).
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Juglone \Ju"glone\, n. [L. juglans the walnut + -one.] (Chem.)
   A yellow crystalline substance (C10H6O3) resembling
   quinone, extracted from green shucks of the walnut (Juglans
   regia); -- called also nucin. Chemically, it is
   5-hydroxy-1,4-naphthalenedione.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Madeira \Ma*dei"ra\, n. [Pg., the Island Madeira, properly,
   wood, fr. L. materia stuff, wood. The island was so called
   because well wooded. See Matter.]
   A rich wine made on the Island of Madeira.
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         A cup of Madeira, and a cold capon's leg. --Shak.
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   Madeira nut (Bot.), the European walnut; the nut of the
      Juglans regia.
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The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]
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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.
         [1913 Webster]

   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.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Juglans regia
    n 1: Eurasian walnut valued for its large edible nut and its
         hard richly figured wood; widely cultivated [syn: English
         walnut, English walnut tree, Circassian walnut,
         Persian walnut, Juglans regia]