Nutgall | definition of nutgall by Medical dictionary
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An excrescence on Quercus infectoria (family Fagaceae) and sometimes other species of Quercus (oak), caused by the deposit of the ova of a fly, Cynips gallae tinctorae; an astringent and styptic because of the tannin it contains.
A growth on certain oak trees produced by insect eggs and larvae. Gallic and tannic acids are obtained from these growths.
References in periodicals archive
He reports that prominent Roman physician Galen attempted to improve the appearance of patient's eyes by using a heated metal rod to cauterise the surface of the eyeball, after which he applied powdered nutgalls
or pomegranate bark mixed with a copper salt to the area.
A man of his position, who has sunk until today he must pick up nutgalls
for other people, and buy skins in the villages for the Jews.