GNU Collaborative International Dictionary of English

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1.       
   Walnut , 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. valnöt, Dan valnöd.  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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   ☞ 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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