1 oak apple | Definition of oak apple

oak apple

noun

Definition of oak apple

: a large round gall produced on oak leaves and twigs by a gall wasp (especially Amphibolips confluenta)

First Known Use of oak apple

15th century, in the meaning defined above

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More from Merriam-Webster on oak apple

Rhyming Dictionary: Words that rhyme with oak apple

Britannica.com: Encyclopedia article about oak apple