[wawl-nuht, -nuht]
the edible nut of trees of the genus Juglans, of the North Temperate Zone. Compare walnut family.
the tree itself.
the wood of such a tree.
Northeastern U.S. the hickory nut.
any of various fruits or trees resembling the walnut.
a somewhat reddish shade of brown, as that of the heartwood of the black walnut tree.

before 1050; Middle English; Old English wealh-hnutu literally, foreign nut; see Welsh, nut

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World English Dictionary
walnut (ˈwɔːlˌnʌt)
1.  any juglandaceous deciduous tree of the genus Juglans, of America, SE Europe, and Asia, esp J. regia, which is native to W Asia but introduced elsewhere. They have aromatic leaves and flowers in catkins and are grown for their edible nuts and for their wood
2.  the nut of any of these trees, having a wrinkled two-lobed seed and a hard wrinkled shell
3.  the wood of any of these trees, used in making furniture, panelling, etc
4.  a light yellowish-brown colour
5.  made from the wood of a walnut tree: a walnut table
6.  of the colour walnut
[Old English walh-hnutu, literally: foreign nut; compare Old French noux gauge walnut, probably translation of Vulgar Latin phrase nux gallica (unattested) Gaulish (hence, foreign) nut]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. walhnutu "nut of the walnut tree," lit. "foreign nut," from wealh "foreign" (see Welsh) + hnutu (see nut). Cf. O.N. valhnot, M.L.G. walnut, M.Du. walnote, Du. walnoot, Ger. Walnuß, So called because it was introduced from Gaul and Italy,
distinguishing it from the native hazel nut. Cf. the L.L. name for it, nux Gallica, lit. "Gaulish nut." Applied to the tree itself from 1600 (earlier walnut tree, c.1400).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They discovered oils in the mix of layers, probably either walnut or poppy seed
McDonald's sells healthy fast food, such as fruit and walnut salad, as well as
  the usual slabs of meat and cheese in a bun.
Hazelnuts and espresso-grind coffee make them much more interesting than the
  plain walnut versions you've doubtless tried.
Hand made from walnut and maple, this elite cutting board would make a great
  gift for any geek-chef.
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