Source : Webster's Revised Unabridged Dictionary (1913)

   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 ({J. 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}, or {European}, {walnut}, a tree ({J. 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 ({J. cinerea}), bearing
      long, oval, thick-shelled, oily nuts, commonly called
      butternuts. See {Butternut}.

European \Eu`ro*pe"an\, a. [L. europeaus, Gr. ?, fr. Gr. ? (L.
   europa.)]
   Of or pertaining to Europe, or to its inhabitants.

   {On the European plan}, having rooms to let, and leaving it
      optional with guests whether they will take meals in the
      house; -- said of hotels. [U. S.]

European \Eu`ro*pe"an\, n.
   A native or an inhabitant of Europe.

Source : WordNet®

European
     adj : of or relating to or characteristic of Europe or the people
           of Europe; "European Community"

European
     n : a native or inhabitant of Europe