wal ‧ nut /ˈwɔːlnʌt $ ˈwɒːl-/ BrE AmE noun
[ Language: Old English ; Origin: wealhhnutu , from Wealh 'Welsh person, foreigner' + hnutu 'nut' ; because it was brought into Britain from abroad, probably by the Romans ]
1 . [countable] a nut that you can eat, shaped like a human brain:
coffee and walnut cake
2 . [countable] ( also walnut tree ) a tree that produces this type of nut
3 . [uncountable] the wood from a walnut tree, often used to make furniture