Jug·lan·din n.  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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 Jug·lan·dine n. An alkaloid found in the leaves of the walnut (Juglans regia).

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 Ju·glone n.  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.

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 Ma·dei·ra n.  A rich wine made on the Island of Madeira.
    A cup of Madeira, and a cold capon's leg.   --Shak.
 Madeira nut Bot., the European walnut; the nut of the Juglans regia.

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 Wal·nut n.  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.
 Note: ☞ In some parts of America, especially in New England, the name walnut is given to several species of hickory (Carya), and their fruit.
 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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 Juglans regia
      n : 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]