A spongy spherical gall which forms on oak trees in response to the developing larvae of a gall wasp.
没食子，栎五倍子
The wasp is Biorhiza pallida (in Europe) or Amphibolips confluenta (in America), family Cynipidae
Example sentencesExamples
Oak apple galls are sometimes mistaken for an actual crop of the tree, such as apples on on apple tree, but are actually deformed leaves.
An oak apple is also known as an oak gall.
The so-called oak apple, a round, spongy, fruitlike object about 2.5 to 5 cm (1 to 2 inches) in diameter, is caused by the larvae of the gall wasp Biorhiza pallida.
Definition of oak apple in US English:
oak apple
nounōk ˈapəl
A spongy spherical gall which forms on oak trees in response to the developing larvae of a gall wasp.
没食子，栎五倍子
The wasp is Biorhiza pallida (in Europe) or Amphibolips confluenta (in America), family Cynipidae
Example sentencesExamples
The so-called oak apple, a round, spongy, fruitlike object about 2.5 to 5 cm (1 to 2 inches) in diameter, is caused by the larvae of the gall wasp Biorhiza pallida.
Oak apple galls are sometimes mistaken for an actual crop of the tree, such as apples on on apple tree, but are actually deformed leaves.