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Definition of Oak apple
1. Noun. Oak gall caused by larvae of a cynipid wasp.
Generic synonyms: Gall
Medical Definition of Oak apple
1. 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. (05 Mar 2000)