Etymology
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walnut (n.)

Old English walhnutu "nut of the walnut tree," literally "foreign nut," from wealh "foreign" (see Welsh) + hnutu (see nut). Compare Old Norse valhnot, Middle Low German walnut, Middle Dutch walnote, Dutch walnoot, German Walnuss. So called because it was introduced from Gaul and Italy, distinguishing it from the native hazel nut. Compare the Late Latin name for it, nux Gallica, literally "Gaulish nut." Applied to the tree itself from 1600 (earlier walnut tree, c. 1400).

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Definitions of walnut

walnut (n.)
nut of any of various walnut trees having a wrinkled two-lobed seed with a hard shell;
walnut (n.)
hard dark-brown wood of any of various walnut trees; used especially for furniture and paneling;
walnut (n.)
any of various trees of the genus Juglans;
Synonyms: walnut tree
From wordnet.princeton.edu