Meaning

noun nut of any of various walnut trees having a wrinkled two-lobed seed with a hard shell

noun hard dark-brown wood of any of various walnut trees; used especially for furniture and paneling

noun any of various trees of the genus Juglans

originFrom Middle English walnote, walnutte, walnotte, from Old English wealhhnutu (“walnut”, literally “foreign nut”), from Proto-Germanic *walhaz (“foreigner”) + *hnuts (“nut”). Cognate with Dutch walnoot, German Walnuss, Swedish valnöt, Icelandic valhneta. Compare more recent term Welsh onion, which also uses Welsh to mean “foreign”.

Etymology from Wiktionary, CC BY-SA 3.0