walnut tree

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Also see: tree

Concise Oxford English Dictionary © 2008 Oxford University Press:
walnut/ˈwɔːlnʌt/

▶noun

• 1 an edible wrinkled nut enclosed by a hard shell, produced inside a green fruit.

• 2 the tree which produces walnuts, with compound leaves and valuable wood. [Juglans regia and related species.]

– origin OE walh-hnutu, from a Gmc compound meaning ‘foreign nut’.