1. an edible nut with a hard, wrinkled shell and a brain-like kernel inside
2. a tree that produces walnuts, having compound leaves and valuable timber
3. the hard, dark brown wood of the walnut tree, used for making furniture

Examples

• She cracked open a walnut and ate the meat inside.
• The recipe calls for chopped walnuts in the brownies.
• A large walnut tree grew in their backyard.
• The dining table was made of beautiful walnut wood.
• He collected walnuts that had fallen from the tree.
• The walnut finish on the cabinet looked elegant.
• Walnuts are rich in healthy omega-3 fatty acids.