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Definition of Knoppern
1. n. A kind of gall produced by a gallfly on the cup of an acorn, -- used in tanning and dyeing.
Definition of Knoppern
1. Noun. A kind of gall produced by a gallfly on the cup of an acorn, and formerly used in tanning and dyeing. ¹
¹ Source: wiktionary.com
Medical Definition of Knoppern
1.