Juglans regia
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]

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]


The Collaborative International Dictionary of English. 2000.

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  • Juglans regia — 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 …   The Collaborative International Dictionary of English

  • Juglans regia — 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… …   The Collaborative International Dictionary of English

  • Juglans regia — Juglandine Jug lan*dine, n. An alkaloid found in the leaves of the walnut ({Juglans regia}). [1913 Webster] …   The Collaborative International Dictionary of English

  • Juglans regia — 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. [1913 Webster] A cup of Madeira, and a cold capon… …   The Collaborative International Dictionary of English

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