A surname from German.

plural of Knopp

(obsolete) Having knops or knobs; fastened as with buttons.

A kind of gall produced by a gallfly on the cup of an acorn, and formerly used in tanning and dyeing.

plural of knoppern

plural of knopper gall

A gall that develops on the pedunculate oak, induced by the wasp Andricus quercuscalicis.

lumpy; knotty