Webster’s Revised Unabridged Dictionary · 1913
Knoppern
Knop′pern, n. [Cf. G. knopper. See Knop.] (Zoöl.) A kind of gall produced by a gallfly on the cup of an acorn, — used in tanning and dyeing.
Webster’s Revised Unabridged Dictionary · 1913
Knop′pern, n. [Cf. G. knopper. See Knop.] (Zoöl.) A kind of gall produced by a gallfly on the cup of an acorn, — used in tanning and dyeing.