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

Example:
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Taxonomy
gallnut, Wiktionary, smell, gallnuts, free dictionary, search, tree, Quotations, country, turnips, peel, little wood, pavilion, Macmillan Press, paperback, languages, English nouns, Personal tools.

Defination from the web:
gallnut (plural gallnuts) slight protuberance on a tree, caused by insects [edit] Quotations. 1916 -- James Joyce, Portrait of the Artist as a Young Man ... Retrieved from "http://en.wiktionary.org/wiki/gallnut" Category: English nouns. Views. Entry. Discussion. Edit. History ...