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Oak apple

From Biology-Online Dictionary | Biology-Online Dictionary
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oak apple --> nutgall

An excrescence on the oak, quercus infectoria (family Fagaceae) and other species of Quercus, caused by the deposit of the ova of a fly, Cynips gallae tinctorae; an astringent and styptic, by virtue of the tannin it contains.

Synonym: gall, galla, oak apple.