nutgall

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Related to oak apple: Oak Apple Day

nut·gall

(nŭt'gahl),
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.
Synonym(s): gall (3) , galla, oak apple

nutgall

(nŭt′gawl)
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 ?
Oak Apple House, Deansfield Road, Brewood, price tag pounds 435,000.
Anyway, tonight's episode, Dead Letters, is set during the village's annual knees-up, Oak Apple Week.
Backing him to the hilt were the victorious Oak Apple Syndicate, who comfortably carried off the prize for the least restrained vocal performance of the day.
THE Royalist celebration of Oak Apple Day is being recreated on Saturday at Beamish Museum.
WARWICKSHIRE: Like Joan Collins, Oak Apple Cottage has aged better than the rest of us could dream.
1651: Oak Apple Day marks King Charles II finding safety in an oak tree in the grounds of Boscobel House, Shropshire, after the Battle of Worcester.