listen to the pronunciation of gallnut
Englisch - Türkisch
Englisch - Englisch
slight protuberance on a tree, caused by insects

There was the smell of evening in the air, the smell of the fields in the country where they digged up turnips to peel them and eat them when they went out for a walk to Major Barton's, the smell there was in the little wood beyond the pavilion where the gallnuts were. (Macmillan Press Ltd, paperback, 62).

A round gall produced on the leaves and shoots of various species of the oak tree
See Gall, and Nutgall