Knoppern

Knop'pern noun [ Confer German knopper . See Knop .] (Zoology) A kind of gall produced by a gallfly on the cup of an acorn, -- used in tanning and dyeing.
Found on http://www.encyclo.co.uk/webster/K/16

knoppern

<zoology> A kind of gall produced by a gallfly on the cup of an acorn, used in tanning and dyeing. ... Origin: Cf. G. Knopper. See Knop. ... Source: Websters Dictionary ... (01 Mar 1998) ...
Found on http://www.mondofacto.com/facts/dictionary?knoppern

Knoppern

• (n.) A kind of gall produced by a gallfly on the cup of an acorn, -- used in tanning and dyeing.
Found on http://thinkexist.com/dictionary/meaning/knoppern/
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