What is the meaning of the word "oak apple"?
Historically, oak apples have been used in ink production, particularly for iron gall ink, which was a standard writing and drawing ink in Europe from the 12th to 19th centuries.
Definitions:
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A spongy spherical gall which forms on oak trees in response to the developing larvae of a gall wasp.
NOUN
- Oak apples have been used since ancient times for making ink, painting wool, and painting silk.
- Oak apples have been used since ancient times for making ink, painting wool, and painting silk.