The Collaborative International Dictionary
Nutgall
Nutgall \Nut"gall`\, n. A more or less round gall resembling a nut, esp. one of those produced on the oak and used in the arts. See Gall, Gallnut.
Wiktionary
nutgall
n. An enlarged growth on a tree formed in response to damage or parasite. Sometimes called just a gall.
Usage examples of "nutgall".
Oncle Jazon winked at the gray sky and puckered his mouth so that it looked like a nutgall on an old, dry leaf.
For grey hair he suggests certain hair dyes, as nutgalls, red wine, and so forth.