Pronunciation US: IPA: /ˈwɑlnət/ UK: IPA: /ˈwɔlnət/ Etymology Middle English walnot, from Old English wealhhnutu, from Latin nux gallia Noun walnut (pl. walnuts) A hardwood tree of the genus Juglans. The nut of the walnut tree. The wood of the walnut tree. A dark brown colour, the colour of walnut wood. Translations German: Walnussbaum m (1), Walnuss f (2), Nussbaumholz n (3), dunkelbraune Farbe f (4)