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. It also contains 2-3% of gallic acid.

Synonym: gallnut, gall, galla, oak apple.

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