Old English walhhnutu, from Proto-Germanic *walhaz (“Celt, Roman, foreigner”) (whence Walloon, Welsh) + *hnutuz (whence nut). Cognate with Dutch walnoot, German Walnuss, Swedish valnöt. Compare more recent term Welsh onion, which also uses Welsh to mean “foreign”.
walnut (usually uncountable; plural walnuts)
- A hardwood tree of the genus Juglans.
- A nut of the walnut tree.
- Wood of the walnut tree.
- Dark brown colour, the colour of walnut wood.
walnut (not comparable)
- Having a dark brown colour, the colour of walnut wood.
Derived terms 
See also