walnutwal‧nut /ˈwɔlnʌt/ noun 
1
[countable] a slightly bitter nut with a large light brown shell, or the tree on which this grows2[uncountable] the dark brown wood of this tree
1 [countable] a slightly bitter nut with a large light brown shell, or the tree on which this grows2[uncountable] the dark brown wood of this tree
